Think of Google as the worlds biggest index. We always describe Google as a librarian working at the world biggest library. You ask the librarian about a specific book or perhaps a book an a topic.
Any librarian points you to the right section and you can look through the books and find one that best suits you. A great librarian will give you a book that answers all your questions about you topic. Google aims to be the latter and the books are the websites.
Google thinks about searchers and their intent, what HFH does is relating your information in the best way to Google. It is essential that Google knows what your website is about and who might be interested in visiting your website.