Pyrokinesis

Pyrokinesis is the ability to exert energy and cause objects even people to spontaineoulsy combust. This power is mostly shown being used by witches. Some lower level magic practicers may have to say a spell to create fire, like Tara, and Willow in season 5 when she said a spell to make the gril flame. The user of this ability doesnt always just make thing burst into flames, they can created fire balls, darts, and jets using the power of their mind.