This was one of the earliest way of indexing the 'World Wide Web'. It was used before search engines were invented.
In those days there were so few web pages that they could be indexed like a book and Gopher made this 'book' available on the Internet. It identified the server, directory and filename of the item being searched for.
Challenge see if you can find out one extra fact on this topic that we haven't already told you
Click on this link: Gopher internet search