Geostationary Satellites ? very short answer :
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Answer:
A geostationary satellite is an earth-orbiting satellite, placed at an altitude of approximately 35,800 kilometers (22,300 miles) directly over the equator, that revolves in the same direction the earth rotates (west to east). ... BGAN, the new global mobile communications network, uses geostationary satellites.
It is a satellite that is placed above the equator of the Earth at such an altitude that it rotates at the same speed or rate as the Earth.
This means that it is may seem to be stationary according to the ground as it always stays directly above the equator but it is actually moving with the same velocity and in the same direction as the Earth.
These satellites are used to proved images or the Earth and weather reports.
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