Can you provide a concise explanation of the theory of relativity as proposed by Albert Einstein?

Albert Einstein's theory of relativity is a fundamental theory in physics that describes how time and space are interconnected. It consists of two main parts: the special theory of relativity, which deals with the relationship between space and time for objects moving at constant speeds, and the general theory of relativity, which extends this to include the effects of gravity. The theory has had a profound impact on our understanding of the universe and has been confirmed through numerous experiments and observations.