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Capacity for doing work is called energy. It may potential, kinetic, thermal, electrical, chemical etc.... capacity of a physical system to perform work. Energy will be in form of heat , light etc...

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a body capable of doing work, is said to possess energy. the energy possessed by a body is measured by amount of work that the body can perform. whe a body does work, its energy decreases, while if work is done on a body its energy increases.this means that there is always a transfer of energy whenever work is done. thus energy and work are related to each other . we can define energy as follows = the energy of a body is its capacity to do work and the S.I unit of energy is joule
hope this is the answer for ur question
Energy is the capacity to do work.
Different types of energy are: 
Light energy
Chemical energy
Electrical energy
Mechanical energy ( sum of potential and kinetic energy )

Potential energy is the energy possessed by an object due to virtue of its position and configuration.
Kinetic energy is the energy possessed by an object due to its motion.
The energy can be present in different forms.
For eg, heat, light, wind etc

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