The satellites that orbit the Earth and receive radio, television, and telephone signals and then transmit them around the world are called communications satellites. These satellites are placed in geostationary orbit, which means that they orbit the Earth at the same speed that the Earth rotates, so they appear to be stationary from the ground. This allows them to provide continuous coverage to a specific area of the Earth.

Communications satellites are used for a variety of purposes, including:

* Television broadcasting: Communications satellites are used to broadcast television signals from one part of the world to another. This allows people in different countries to watch the same television programs.

* Radio broadcasting: Communications satellites are used to broadcast radio signals from one part of the world to another. This allows people in different countries to listen to the same radio programs.

* Telephone calls: Communications satellites are used to transmit telephone calls from one part of the world to another. This allows people in different countries to talk to each other on the phone.

* Internet: Communications satellites are used to provide internet access to remote areas of the world. This allows people in these areas to connect to the internet and access information and services online.

Communications satellites play a vital role in modern society by providing us with the ability to communicate with people around the world.