There are several types of touch gestures such as basic or common and pinch or stretch.

Basic touch gestures include the following:

Gesture	Description
Tap	One finger touches the screen and lifts up.
Press and hold	One finger touches the screen and stays in place.
Slide	One or more fingers touch the screen and move in the same direction.
Swipe	One or more fingers touch the screen and move a short distance in the same direction.
Pinch	Two or more fingers touch the screen and move farther apart or closer together.
Rotate	Two or more fingers touch the screen and move in a clockwise or counter-clockwise arc.
Switch	Two or more fingers touch the screen and move farther apart.

Spread.Sheets uses standard pinch and stretch gestures when zooming. For more information, see http://msdn.microsoft.com/en-us/library/windows/apps/hh465415.aspx.