Introduction: - To understand satellite communication, interested aspirants are required to know about the basic concepts of communication satellite. In this article, the basic idea of satellites, orbits,  earth stations, satellite communication etc. is explained. What is a satellite? A satellite is a smaller object in space that orbits/moves around a bigger object. For example, Earth is a satellite of the sun because it moves around the sun. Similarly, the moon is a satellite of the Earth because it moves around it. The above-mentioned satellites (earth and moon) are natural satellites and are doing their natural jobs. However, we are going to discuss here other satellites that are made by scientists and are moving around the earth for some assigned/specific jobs. These satellites that scientists make are called man-made or artificial satellites. The artificial satellites may be further classified based on their functions.   Below, we illustrate some of them.