What would something like this be called?

Hello all and good evening,

If you go to www.realtree.com, they have an "Articles and How-To" spot where when you click one of those buttons, such as "Most Popular", it switches to a different information box while not showing the previous. How would I go about creating something like that and what exactly is something like that called? Is there any good templates that I could download for that?

Thanks in advance!

Dalton