From St. Louis Hackerspace Wiki
Google is the world's most well recognized search engine.
The entire existence of Google is founded in its original product: Its search engine.
Google Image Search
Google Image Search (sometimes referred to as GIS) is Google's image search engine which looks up images relevant to the search you are looking for.
Google News is another search product by Google that searches news websites about what you are looking for. It has come under fire by some news publishers who want visitors to pay for content rather than rely on online advertising.
Google's successful revenue flow is partial due to it's Google Ads service, which allows companies to advertise their products and users to find products relevant to their interests.
Because marketing business experts constantly speculate that online advertising is drying up (which it isn't), a lot of doubt has been generated as to whether Google can continue to generate such strong revenue.