What does e equals mc spared mean?

Answer 1

Unless this is a joke, I think you mean squared.

e = mc2 is a famous equation by Albert Einstein. Probably the most famous equation of the 20th century. E stands for energy, m for mass and c for the speed of light (a "c" because the speed of light in a vacuum is a universal constant). Amongst other things it tells us that mass is equivalent to energy, and that a small amount of mass can provide a huge amount of energy.

If you are interested just search on the internet, or in a science book, for "special theory of relativity".