On the home page after logging in, you'll see photos of different activities and pastimes, under the "How does this picture make you feel" heading. These are your profile Tags.
If you indicate that you strongly like anything in this section, it will appear on the Tags section of your profile.
You can use this as a search option in order to refine your search and find any other members who like the same things!
The more accurate tags you have on your profile, the smarter the Search page will get in finding you suitable matches, and the more likely other people are going to find you when they search for the same interests.