The Internet is an international network of computer networks. It was created in the 1960s by the U.S. Department of Defense as a way of sharing vital information between computers. As other countries developed computer networks, they also became part of the Internet.
Nobody is in charge of the Internet, and anybody can put up a web page.
The answer is search engines. Search engines are huge databases of web pages that have been compiled for your use. There are many different search engines and they all work in slightly different ways. No single search engine compiles the entire World Wide Web, so it's a good idea to be familiar with more than one. If you want to have a look at these search engines, go ahead and click on the names.