## With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

No credit card required

### What’s a Variable?

The variables that we use in writing code are the very same variables that we learned about in school. Take the following equation for example:

`a2 + b2 = c2`

I’m sure you’ve seen this before; it’s the Pythagorean theorem and it’s pretty useful for finding the length of one side of a right-angle triangle if we know any of the other two sides. The letters `a`, `b`, and `c` are the names for numerical data, in this case the letter `c` is used for the hypotenuse while `a` and `b` are the other two sides of the triangle. We can also call these letters variables. Variables are quite simply containers for information. In programming, variables have a name that tells us what data the variable might contain and they have a type that determines ...

## With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

No credit card required