# Deriving Einstein’s most famous equation: Why does energy = mass x speed of light squared?

E=mc^2 is perhaps the **most famous equation in all physics**, but very few people actually know what the **equation means**, or where it comes from. In this video I would like to show one method for deriving this equation, as well as provide some insight into what the equation actually means. Along the way we will also touch upon some of the most fascinating **features of Einstein’s theory of special relativity**, including time dilation, the reason why nothing can travel faster than the **speed of light**, and the relationship between energy and momentum for massless particles.

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