Question

what is theory of relativity?

Answer 1

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➡️ The theory of relativity usually encompasses two interrelated theories by Albert Einstein: special relativity and general relativity.

➡️ The laws of physics are the same for all observers in uniform motion relative to one another (principle of relativity). The speed of light in a vacuum is the same for all observers, regardless of their relative motion or of the motion of the light source.

Answer 2

The theory of relativity usually encompasses two interrelated theories by Albert Einstein: special relativity and general relativity.[1]Special relativity applies to elementary particles and their interactions, describing all their physical phenomena except gravity. General relativity explains the law of gravitation and its relation to other forces of nature.
 It applies to the cosmological and astrophysical realm, including astronomy