sstv (slow-scan television) is a way of sending a picture on radio waves, it is different from normal television because only one picture is sent very slowly, hence why it's called slow scan, instead of 24 or 30 pictures per second on normal television, sstv is also not used for entertainment, although radio hobbyists may enjoy collecting pictures that they receive, or seeing if they can receive a picture from a very far away transmitter (dxing).