Respected sir/mam, 

What is light, is it a object which we can only see but cannot fell; if so does light has mass and energy?

Light is not a physical object. It is an electromagnetic wave which can be seen by humans but not felt.

 

An electromagnetic wave is a wave which has an electric as well as a magnetic field associated with it. Due to this, it can travel through a vacuum.

 

From the above statements, it is clear that light is a wave. But, it also behaves like a particle. So, we can conclude that light exhibits wave-particle duality. Light is composed of tiny packets called photons. Now, photons do not have mass. Hence, light does not have mass. But, it has energy and momentum.