Development of basic technology

Launch of search engine

Attachments like gmail and classroom come later

Internationalization

Search is launched in 13 new languages

Launches search cateogries, like:

The beginning of explicitly announced search algorithm updates

Faster search experience for user:

Google starts using web histories to help in searches (2005)

Experimentally launches social search (2009)

Launches Search Plus Your World (2012)

Caffine update for faster indexing of the web and fresher and on-topic search results.

Released Google Panda

With Panda, Google's goal was to include cracking down on spam, content farms, scrapers, and websites with a high ad-to-content ratio

Google integrates Google Knowledge Graph into its search results