Satellites are launched into space on rockets. they are launched on certain positon to avoid crashing into each other.
When they are launched they orbit a star or planet, Earth for exemple. They can capture information that would be impossible to obtain from earth's surface.
Then the data from the satellite is transmitted to Earth, then collected by the deep space network (DSN), antennas that generates the radio waves and processes the information.
Then the data that can include the health of the satellite, where it is located and some pictures the satellite took is transferred to a lab where it is transformed into many types of information, such as wifi,