What is the primary purpose of a tow plane in glider operations?

The primary purpose of a tow plane in glider operations is to lift the glider to altitude for release. This is an essential function because gliders do not have their own engines and rely on being towed aloft before they can glide. The tow plane provides the necessary thrust to elevate the glider to a suitable altitude, allowing it to take advantage of rising air currents and thermals to sustain flight without the use of an engine. Once the glider reaches the desired altitude, the tow plane releases the glider, enabling it to begin its flight path. This process is critical for efficient and effective gliding, making the tow plane a vital component of glider operations.