Question

what is energy? what is different kinds of ?

Answer 1

The physics definition of energy is that it's the ability to do work. Energy is like a currency that can be spent when we want to do work. If we have plenty of energy in our bodies, we can apply more forces over longer distances and do more work than if we had less energy.

Types of Energy

We've already talked about a few of the types of energy. But let's go through some more.

Kinetic energy is the kind of energy we all know about: movement energy. The faster you move, the more kinetic energy you have. A variation on kinetic energy is mechanical energy, which is movement energy when something turns around a pivot, like an arm bending, or a wheel spinning, or an engine cranking.

Chemical energy is another obvious one. The food that you ate contained the energy you needed to do that movement. So chemical energy is energy stored in chemicals, like the food we eat or the gas we put in a car.

Potential energy is a general term for any kind of stored energy. Chemical energy could be called chemical potential energy. When you stretch a rubber band, you're storing elastic potential energy in the spring. And when you lift a ball high in the air, you're giving it gravitational potential energy. We know this, because of what happens when you let go. When you let go of a rubber band, it springs back and that energy is released and when you drop a ball, it falls towards the ground.

A few of them are pretty clear from their names: Sound energy is the energy in sound. Light energy is the energy inside light, including invisible kinds of light, like infrared, radio waves, or microwaves. Electrical energy is energy transferred by electricity. And heat energy is the energy emitted through heat. 

Answer 2

energy is the ability to do work.
Different kinds of energy are thus
kinetic energy, potential energy ,mechanical energy, chemical energy, physical energy, heat energy, light energy ,atomic energy, electrical energy ,etc.