ELI5: Explain Like I'm 5

speed of light

The speed of light is a super fast speed that nothing can go faster than. It is what we call the speed of light in a vacuum, meaning that nothing is in the way. Think of it like a race car: if you are in a race car, and there's nothing in your way, you can drive really fast! The speed of light is like that, except it's even faster than a race car. It is 186,282 miles per second, or 671 million miles per hour. That is fast!