Instead of giving those instructions for every hamburger, we can group and name them as a single function:

function makeHamburger() {
  Add bread
  Add burger patty
  Add pickles
  Add bread
}

A function is a named sequence of instructions, packaged as a unit, that performs a specific task.

We’ve defined the function by giving it instructions and a name, but how do we use it? We use a function by calling it. When we call makeHamburger() we expect all of its steps to be executed.