Question

what are photons?there are how many types of photons

Answer 1

A proton is a subatomic particle, symbol  

p

or  

p+

, with a positive electric charge of +1e elementary charge and a mass slightly less than that of a neutron. Protons and neutrons, each with masses of approximately one atomic mass unit, are collectively referred to as "nucleons".

One or more protons are present in the nucleus of every atom; they are a necessary part of the nucleus. The number of protons in the nucleus is the defining property of an element, and is referred to as the atomic number (represented by the symbol Z). Since each element has a unique number of protons, each element has its own unique atomic number.

Hope this helps!!

Answer 2

A particle representing a quantum of light or others electromagnetic radiation is known as photons.
There are many types of photons are there like Ultraviolet, infrared etc..