If we brake using engine braking, what will happen?

Engine braking is a technique by which we can reduce the speed of our car thanks to the car's engine and without using the wheel brakes at any time. Thanks to this technique, we will reduce fuel consumption and, in addition, the brake pads and discs of our car will also last longer. It is advisable to use this technique when driving at low or medium revs since, although we drop a gear, the vehicle can perfectly handle the new engine revs.