What are the differences between elastic and inelastic collisions?

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Definition
A collision occurs when two objects come in direct contact with each other. It is the situation in which two or more bodies exert forces on each other in about a relatively short time.
There are two types of collision, such as:
Elastic collision
Inelastic collision
Elastic collisions
A state where there is no net loss in kinetic energy in the system as the result of the collision is called an elastic collision.
Inelastic collisions
A type of collision where this is a loss of kinetic energy is called an inelastic collision. The lost kinetic energy is transformed into thermal energy, sound energy, and material deformation.
Difference between elastic and inelastic collisions
Elastic Collision Inelastic Collision
1.The total kinetic energy is conserved. 1.The total kinetic energy of the bodies at the beginning and the end of the collision is different.
2.Momentum does not change. 2.Momentum does not change.
3.No conversion of energy takes place. 3.Kinetic energy is changed into other energy such as sound or heat energy.
4.Highly unlikely in the real world as there is almost always a change in energy. 4.This is the normal form of collision in the real world.
5.An example of this can be swinging balls or a spacecraft flying near a planet but not getting affected by its gravity in the end. 5.An example of an inelastic collision can be the collision of two cars.

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(b) Is the total linear momentum conserved during the short time of an elastic collision of two balls ?

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Elastic Collision	Inelastic Collision
1.The total kinetic energy is conserved.	1.The total kinetic energy of the bodies at the beginning and the end of the collision is different.
2.Momentum does not change.	2.Momentum does not change.
3.No conversion of energy takes place.	3.Kinetic energy is changed into other energy such as sound or heat energy.
4.Highly unlikely in the real world as there is almost always a change in energy.	4.This is the normal form of collision in the real world.
5.An example of this can be swinging balls or a spacecraft flying near a planet but not getting affected by its gravity in the end.	5.An example of an inelastic collision can be the collision of two cars.