35 Years of Search History
From Archie in 1990 to AI Overviews in 2026: the complete history of SEO, the search engines before Google, and 35 years of algorithm updates.
Alan Emtage, a student at McGill University, builds Archie, the first search engine. It indexes FTP file names, not web pages, because the web does not exist yet. Search is older than the web itself.
SEO impact: the founding idea appears: content is only useful if people can find it.
Search is older than the web itself.
Tim Berners-Lee opens the World Wide Web to the public in August 1991. Exactly one website exists: info.cern.ch. The same year, Gopher launches, soon searched by tools named Veronica and Jughead.
SEO impact: there is now a web to optimize, even if it is one page long.
The first web crawlers appear. World Wide Web Wanderer measures the web's size, JumpStation pairs a crawler with a search form, and Aliweb lets site owners submit their own page descriptions, arguably the first act of SEO. The web holds roughly 130 sites in June 1993.
SEO impact: describing your own site to a search index becomes possible, and someone has to do it.
WebCrawler becomes the first engine to index the full text of pages. Lycos and Infoseek launch the same year. So does Yahoo!, Jerry Yang and David Filo's hand-curated directory, where getting listed becomes the web's first ranking goal. Roughly 2,700 websites now exist.
SEO impact: inclusion is the game: get crawled, get listed, get found.
Digital Equipment Corporation launches AltaVista: fast, full-text, and able to handle natural-language queries. It becomes the most powerful pre-Google engine and the era's dominant crawler. Excite launches the same year. Because engines rank almost entirely on on-page text, early SEO means meta keyword tags and keyword stuffing.
SEO impact: on-page text is everything, and stuffing it works, for now.
At Stanford, Larry Page and Sergey Brin build BackRub, a research project that ranks pages by the links pointing at them. The idea becomes PageRank. Meanwhile Inktomi's index powers HotBot, and the web grows to roughly 257,000 sites.
SEO impact: the link, not just the page, is about to become the unit of authority.
The term search engine optimization comes into use. The google.com domain is registered on September 15, 1997. Ask Jeeves launches natural-language question answering. Text-only ranking is drowning in spam, and the door is open for something better.
SEO impact: the discipline now has a name, just in time for the engine that will define it.
Google incorporates on September 4, 1998, working out of Susan Wojcicki's garage. PageRank makes links the new currency of the web. The same year, GoTo.com (later Overture) invents the paid-search auction, the model AdWords will perfect, and MSN Search launches.
SEO impact: earning links starts to matter as much as writing pages.
Portals still rule the web: Yahoo, Excite, and Lycos own the traffic. But among people who search all day, word spreads that Google's results are simply better.
SEO impact: relevance is becoming a competitive advantage you can feel.
The Google Toolbar publicly exposes PageRank scores, and a link-buying economy is born almost overnight. AdWords launches in October 2000 with 350 advertisers. Google becomes Yahoo's search provider and announces the first billion-page index, the largest in the world. Roughly 17 million websites exist.
SEO impact: PageRank becomes visible, tradeable, and instantly gamed.
PageRank turned links into currency. Currency gets counterfeited.
The dot-com bubble bursts around it, but Google keeps growing. “Google” is becoming a verb.
SEO impact: search demand proves durable even when the industry around it collapses.
Agencies, forums, and conferences emerge as SEO professionalizes. Google ends the year powering the majority of web searches through its own site and its partners.
SEO impact: SEO shifts from webmaster side-task to full-time career.
The Florida update lands in November 2003, and keyword-stuffed, over-optimized sites vanish overnight, many just before the holiday shopping season. Modern algorithmic SEO begins here. The same year, AdSense launches and starts funding the content web.
SEO impact: rankings can now be revoked at scale; chasing loopholes becomes a liability.
Google went public on August 19, 2004, at $85 per share. That same year I started my SEO career, which means every era that follows is one I worked through firsthand, not one I read about later. And the race was still genuinely open: comScore's July 2004 numbers put Google at 36.5% of US searches, Yahoo at 30.4%, and MSN at 15.5%.
SEO impact: search is now a public, accountable business, and a career you can build a life on.
I entered SEO the year Google went public. Neither of us was a sure thing yet.
My first full year in the business, and the ground would not stop moving. Google Maps and Google Analytics launched, Google, Yahoo, and Microsoft jointly introduced rel=“nofollow” to fight link spam, and XML sitemaps arrived. Local search started taking shape, and the web reached roughly 65 million sites. For the first time I could show a client real measurement instead of a hunch.
SEO impact: SEOs get real measurement, structured crawl control, and a new local battleground.
Google acquired YouTube for $1.65 billion, and video became a search surface my clients suddenly asked about. Google Webmaster Tools, today's Search Console, opened the first official data channel between Google and the people doing this work. After two years of reading tea leaves, data straight from the source felt like a gift.
SEO impact: optimizing beyond the web page begins, and Google starts talking to SEOs directly.
In May 2007, Universal Search blended images, news, video, and maps into one results page, and the pure ten-blue-links era began to end in front of us. One month later, on June 29, 2007, the iPhone launched and quietly started the mobile search era. Nobody I worked with grasped how completely that device would rewrite search, and I include myself in that.
SEO impact: every content type is now a ranking opportunity, not just the web page.
Google launched Chrome and rolled out autocomplete with Google Suggest, and Android shipped on its first phone. Watching autocomplete finish a searcher's sentence made the shift plain to me: search stopped being a destination and became ambient.
SEO impact: query behavior itself changes as Google starts finishing people's sentences.
Microsoft launched Bing in June 2009 and signed a search alliance with Yahoo, the last serious challenge anyone mounted to Google's dominance. Google's “Vince” update favored big brands in results, and I began telling clients something new: Google was learning to trust brands, so we needed to build one.
SEO impact: brand strength becomes an explicit advantage in the algorithm.
The Caffeine indexing system delivered an index roughly 50% fresher at massive scale, site speed became a ranking factor in April 2010, and Google Instant showed results as you typed. The web passed roughly 207 million sites. I spent much of that year with timing tools open, because performance was now part of my job description.
SEO impact: performance engineering officially joins the SEO job description.
Panda landed on February 23, 2011, and Google said it affected 11.8% of queries. The content farms flooding every result I tracked collapsed within weeks. In June, Schema.org launched: Google, Bing, and Yahoo agreeing on a shared structured-data vocabulary, the foundation of rich results and, eventually, AI parsing.
SEO impact: thin content becomes a liability, and structured data becomes a long-term asset.
Penguin arrived on April 24, 2012, penalizing link schemes across roughly 3.1% of queries. The Knowledge Graph launched in May 2012 with 500 million entities and 3.5 billion facts: “things, not strings.” Entity SEO was born, and Google passed 1.2 trillion searches per year.
SEO impact: manipulative links now carry penalties, and being a recognized entity starts to matter.
Panda judged your content. Penguin judged your links. Nothing was neutral anymore.
Hummingbird, announced in September 2013, was a full rewrite of the core algorithm for conversational, semantic search, touching roughly 90% of queries. Meaning started beating keyword matching. The same year, organic keyword data went dark as search moved to HTTPS, and analytics filled up with “not provided.”
SEO impact: topics and intent replace exact-match keywords as the unit of strategy.
HTTPS became a ranking signal in August 2014, and Pigeon reshaped local results in July. Featured snippets, “position zero,” spread as Google answered questions directly for the first time. Looking back, that was the tell for everything that followed. In September 2014, the web crossed 1 billion websites.
SEO impact: Google starts answering instead of just linking, and SEOs start optimizing for the answer box.
The pivot year. “Mobilegeddon” made mobile-friendliness a ranking factor on April 21, 2015, and Google pre-announced the date, something it had never done. In May, Google confirmed more searches happened on mobile than desktop in 10 countries including the US. In October, Google revealed RankBrain: machine learning inside the core algorithm, immediately its third most important signal. Google held roughly 92% of global search (StatCounter).
SEO impact: mobile experience and machine learning both become permanent parts of the job.
For the first time, Google announced the earthquake in advance.
Penguin 4.0 went real-time and joined the core algorithm, which meant link penalties finally healed on a human timescale. The Possum update shook up local results. Google Assistant launched, and about 20% of mobile queries were now spoken. I started reading client copy out loud, because that was how a growing share of searches now sounded.
SEO impact: link penalties heal faster, and conversational queries stop being an edge case.
The unconfirmed “Fred” update hit ad-heavy, low-value sites, Chrome began labeling non-HTTPS pages “not secure,” and mobile-first indexing was announced. Three different levers, one message I kept repeating to clients: Google was making user hostility expensive.
SEO impact: monetization-first sites and unencrypted pages both start paying a visible price.
Mobile-first indexing rolled out in March 2018: Google now ranked the mobile version of your site. Then, on August 1, 2018, the “Medic” core update devastated health and finance sites that could not demonstrate real expertise, and E-A-T entered every SEO's vocabulary, mine included.
SEO impact: expertise, authority, and trust become rankable qualities, especially where stakes are high.
In October 2019, BERT brought neural natural-language understanding to 1 in 10 English queries, and Google called it the biggest leap forward in five years. Context finally beat keywords. For those of us who had spent years writing around awkward exact-match phrases, it felt like a quiet vindication.
SEO impact: writing for humans and writing for Google stop being different skills.
The algorithm learned to read. Writing for it stopped being a trick.
COVID rewrote search behavior overnight, and I watched client dashboards swing in ways no playbook covered. Core Web Vitals were announced in May 2020. And on October 20, 2020, the US Department of Justice filed its landmark antitrust suit against Google.
SEO impact: user experience gets measurable thresholds, and Google's dominance gets a court date.
The Page Experience update shipped Core Web Vitals as ranking signals in June 2021, while link-spam and product-review updates kept the quality push going. The UX arguments I had been making on instinct since 2010 finally came with measurable thresholds attached.
SEO impact: lab-measurable UX metrics now move rankings, not just opinions about design.
The Helpful Content Update in August 2022 made “people-first content” official policy, and in December E-A-T gained an extra E for Experience. Then, on November 30, 2022, ChatGPT launched: 1 million users in 5 days, 100 million in two months, the fastest-growing consumer app in history at the time.
SEO impact: a second kind of search engine now exists, and it answers in prose instead of links.
Microsoft put GPT-4 into Bing in February. Google rushed out Bard in March and announced the Search Generative Experience at I/O in May. My job description changed in real time: rank in the links, and get cited in the answers.
SEO impact: AI visibility becomes a deliverable alongside rankings.
AI Overviews rolled out across US search in May 2024. The March 2024 core update and the site-reputation-abuse policy purged low-quality content, with Google reporting a 45% reduction in unhelpful content in results. In August 2024, Judge Amit Mehta ruled Google an illegal monopoly in search. ChatGPT Search launched in October. And the zero-click reality set in: 58.5% of US searches ended without a click to the open web.
SEO impact: the answer layer goes mainstream, and clicks stop being the whole scoreboard.
The new question isn't 'where do we rank?' It's 'are we the answer?'
AI Mode launched at I/O and rolled out across the US. Google disclosed it handled more than 5 trillion searches per year, roughly 14 billion per day. ChatGPT passed 800 million weekly users by fall, and the Gemini app reached 750 million monthly users in Q4 2025. Antitrust remedies arrived in September: no Chrome divestiture, but mandated data sharing. And Google's global share slipped below 90%, the first sustained erosion since 2009. That last number was the one I never expected to watch happen.
SEO impact: search volume has never been higher, and Google's grip has never been looser.
AI Overviews reached more than 2 billion people monthly (Google), AI Mode passed 1 billion monthly users, and ChatGPT hit roughly 900 million weekly users (OpenAI, February 2026), about double a year earlier. Studies placed AI Overviews on anywhere from ~26% to ~60% of US queries depending on category. Independent testing measured a ~38% drop in clicks when one appeared, and Google search traffic to publishers fell 33% in the year to November 2025 (Reuters Institute). Google still holds ~89-90% of classic search, but discovery now spans ChatGPT, Gemini, Perplexity, and AI Overviews. Twenty-two years in, I have never rewritten my own playbook this fast. SEO's newest chapter is GEO, AEO, and AIO: being the answer, not just the ranking.
SEO impact: the job is now visibility across every answer engine, which is exactly what AI consulting addresses.
The macro trends that defined 35 years of digital visibility.