Amateur radio is a community of people that uses radio transmitters and receivers to communicate with other Amateur radio operators. Amateur radio operators are often called ham radio operators or simply "hams". Amateur (HAM) Radio is truly a hobby but often one that makes a difference especially in emergency or disaster situations. It is an activity of Self Learning, InterCommunication & Technical Investigation carried on between Amateur Radio Operators. Amateurs talk to local friends over the radio waves using a hand-held transreceiver, communicating digitally with packet radio to exchange personal messages or vital information in an emergency, talking to other hams anywhere in the world, or engaging in contests with other Radio Amateurs over the airwaves. The participants are made aware about the applications and rules.