You name it. You can talk to people all over the world using voice, television, teletype, computer-based communications, and more. You can talk to people via satellites, meteor scatter, or moon bounce. Many hams like to build and experiment. Hams pass messages for the public in preparation for emergency service.
Some hams compete in contests or try to win award certificates.
Of course, not all hams do all those things. That's the great thing about the hobby, if you get bored with something, there is always something else you can get involved in. Public service is a big part of ham radio. We handle messages after emergencies like hurricanes and earthquakes. Hams help military personnel call home.