A satellite is a device that is sent into space to orbit the Earth in specific orbits. It is a self-contained communications system that derives its energy from the solar panels it is equipped with.
Satellites were just theoretical ideas in the imagination of scientists and writers, until the Soviets launched the first satellite the size of a beach ball on October 4, 1957. With qualitative improvements in the propulsion and energy systems of satellites, their life span has increased to 20-30 years. Huge constellations of thousands of satellites designed to provide Internet access to anywhere on Earth are currently being developed.