Google Growth Timeline from Since 1997 – Awesome!!
They start on September 1997 by registering the Google.com. and …. the last specific change for search engine was Voice Search.
This infographic shows all the Google steps over these 14 years 
Here is the shortlist of the Google improvements:
- 1997: Google.com has been registered
- 2000: Adwords was added to the Google for Text advertisement
- 2001: Image Search
- 2002: Google News & Google Products
- 2003: Google Books & Stock Quotes
- 2004: Google Local (map)
- 2005: Google Video, Weather, Flights and Google Blogs
- 2006: Sports Scores, Movie Times & Patents
- 2007: Universal Search*
- 2008: Street View
- 2009: Real-time Search
- 2010: Google Instant
- 2011: Voice Search & Search by Image (I love this!)
*: “Universal Results: With Universal Search—which returns results like images, videos, and news, in addition to webpages—we’re helping you find all different kinds of information in the same place. We’ve continued to make search more comprehensive, enabling you to find products, places, patents, books, maps and more.”
Moreover, this video shows all changes in just 6 minutes. I bet it worth to watch
Source: http://googleblog.blogspot.com/2011/11/evolution-of-search-in-six-minutes.html
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