Every Android phone has a standard set of buttons at the bottom. They may be physical -- with parts that move -- or they may be capacitive, reacting to your touch. The order may change, but the functions are the same. You'll find:
- Home: Returns to the main home screen. Hold down to see your most recently used apps. (Tip: Try tapping it again once you're at the main home screen and see what happens.)
- Back: Takes you back a level in an app, or back a page in a browser, etc. (Tip: Hold down while browsing to quickly access bookmarks, history and most-visited sites. Thanks, Snapdragon0503!)
- Menu: Tap this for additional options in an application, or from the home screens. (Tip: Hold down to make the keyboard appear.)
- Search: Brings up the search function. Could be search within an app, Google search, or universal search of contacts, bookmarks, apps, etc. that are in the phone. (Tip: Hold down to launch voice search.)
Most Android phones have four buttons, though occasionally a manufacturer will do without the search button.