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Machines that shoot tennis balls are called, quite simply, tennis ball machines. They are also sometimes referred to as ball machines. More versed players sometimes call them the electronic opponent, or the ruthless server.
There are several manufacturers of tennis ball machines and they all have their own patented name for their special machines. But searching for "tennis ball machine" should get you what you are looking for.
Tennis ball machines can be used to practice returning balls. By using a machine you don't have to find anyone to practice with. You can also set the speed of the ball to be constant so that you can stretch yourself.