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Touch plugin's main purpose is to display touches on screen, so it is easy for you to see where the user is touching the screen (and how strong are they touching if device supports 3D Touch), especially when presenting.
Touches are displayed on screen in a shade of blue. On devices that support 3D Touch (Force touch), pressing with more force will increase the radius of the visible touch and once the maximum is reached, the touch will turn red (the gif shows an old version).