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Interfacing between control signals and power switches, like MOSFETs and IGBTs; charging the gate capacitor of a transistor to the voltage required to make it switch while supplying enough current to make it switch at the required speed.

Recommended reading:

Microchip application note AN786: Driving Power MOSFETs in High-Current, Switch Mode Regulators

TI application note SLUA618: Fundamentals of MOSFET and IGBT Gate Driver Circuits