"Amateur radio, often called Ham Radio, is both a hobby and a service in which participants, called "hams" use various types of radio communications equipment to communicate with other radio amateurs for public service, recreation and self-training."
Contesting: "Contesting (also known as radiosport) is a competitive activity pursued by amateur radio operators. In a contest, an amateur radio station, which may be operated by an individual or a team, seeks to contact as many other amateur radio stations as possible in a given period of time and exchange information. Rules for each competition define the amateur radio bands, the mode of communication that may be used, and the kind of information that must be exchanged. The contacts made during the contest contribute to a score by which stations are ranked. Contest sponsors publish the results in magazines and on web sites." From Wikipedia.