Kinetic energy is the kind of energy an object has because it's in motion. Speeding cars and hyper children have a lot of kinetic energy.
According to physics, kinetic energy is one of many types of energy that exist. This is energy generated because something is moving — the faster it's going, the more kinetic energy it has. A person sitting has no kinetic energy, but a person running like a maniac has tremendous kinetic energy: if they run into you, you'll feel the brunt of it. Footballs, baseballs, rocks, bullets, airplanes, and anything else moving quickly through the air all have kinetic energy.