Communications Satellites: link up different countries so that TV, radio and telephone calls can be shared.
A geostationary communtications satellite has a geostationary orbit-> this means that the satellite take the same amount of time for an orbit as the earth does (i.e. 24 hours) and travels at this speed. This means that it is constantly above exactly the same point on the equator.
Monitoring Satellites: collect information about the atmosphere.
A Polar Monitoring Satellite has a low Polar orbit-> this means that it continously passes over both the North and South Poles and the Earth spins beneath it
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