Question

Describe the transmission of television programs with the help of an artificial satellite

Answer 1

Artificial satellites help in the transmission of TV Programmes over large area because of their height and their function as signal repeaters. Radio waves travel in a straight line. Assume the Earth is a perfect sphere. A radio wave from the surface would be a tangent to that sphere. This means that from the equator, a signal would not reach something over the horizon. 
A satellite receives a signal from the surface, and re-broadcasts it from a higher place that can see a larger portion of the Earth, including those over the horizon.
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Answer 2

How televisions work with satellites?

Televisions nowadays work directly with satellite connection. The satellites that revolving around the earth receives the transmission signals from the broadcasting stations and send it back to dishes and antennas back that looks up to pick up those signals.  

The broadcasting centers send up the signals to either one satellite or to multiple satellites where the dishes and antennas pick up the signals back from one satellite or from multiple satellites.

The receivers at home process the signals that picked up by the dishes and send them to the television.