That set of processes reduces the forward momentum of the vehicle, which allows you to come to a complete stop whenever necessary.
The pressure from the pedal activates the caliper housing for each set of pads, compressing them into the rotor to create friction.
Rotors, which are sometimes called discs, provide a point of contact for your brake pads when you engage the pedal to stop while driving. There are several different types of rotors available for vehicles today: blanks, drilled, slotted, or drilled and slotted.