Science Define :

Space vehicles used to place satellites in their specific orbits are called Satellite Launch vehicles.

In order to observe and study polar regions, geo-stationary satellites have limitations. Hence, elliptical orbits which pass over the polar regions are used. They are called Polar Orbits.

The orbits of satellites between 180km to 2000 km from the Earth are called Low Earth Orbits.

The orbits of satellites between 2000 km to 35780 km from the surface of the Earth are called Medium Earth Orbits.

The orbits of satellites equal to or more than 35780 km from the surface of the Earth are called High Earth Orbits.

If the satellite is revolving in an orbit parallel to the equator, the time of revolution for the Earth around itself and that for the satellite to revolve around the Earth being the same, the satellite will appear to be stationary with respect to the Earth. These satellite are therefore called Geo-stationary satellite.