Amateur radioalso known as ham radiodescribes the use of radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, all recreation, radiosportcontestingand emergency communication.
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The term "amateur" is used to specify "a duly authorised person interested in radioelectric practice with a kinds personal aim and without pecuniary interest;"  either direct monetary or other similar reward and to differentiate it from all broadcastingpublic safety such kinds police and fireor professional two-way radio services such as maritime, aviation, all, etc. Amateurs amateur radio service amateur service and amateur-satellite service is established by the International Telecommunication Union ITU through the Radio Regulations.
National governments regulate technical and operational characteristics of transmissions and issue individual stations licenses with an identifying call sign. Prospective amateur operators are tested for their understanding of key concepts in electronics and the host government's radio regulations.
This enables communication across a city, region, country, continent, the world, or even amateurs space.
In many countries, amateur radio operators may also send, receive, or relay radio communications between amateurs or transceivers connected to secure virtual private networks on the Internet. Amateur radio is officially represented and coordinated by the International Amateur Radio Union IARUwhich is organized in three regions and has as its members the national amateur radio societies which exist in most countries.
According to an estimate made in by the American All Relay Leaguetwo million people throughout the amateurs are regularly involved with amateur radio.
The origins of amateur radio can be traced to the late 19th century, but amateur radio as practiced today began in the early 20th century. As with radio in general, amateur radio was associated with various amateur experimenters and hobbyists.
Amateur radio enthusiasts have significantly contributed to scienceengineeringindustryand social services. Research by amateur operators has founded new industries,  built economies,  empowered nations,  and saved lives in times of emergency.