In the entire world there are around 509,147 data centers that operate for web hosting, ISP service, Telephone Service and much more.
Google alone has a lot of data centers and web servers inside those data centers.
Amazingly there are enough data centers in the entire world to cover the space of 5,955 football fields.
It takes a lot of web servers and data centers to operate the internet and host all those websites that you visit and Google has millions of web servers just to host the videos on Youtube and also to host Google.com and perform the search queries.
Then there's Bing search, yahoo search and every other hosting provider out there that have data centers where people host their websites.