The RUN command executes a saved sequence of numbered lines.

If you write a program, you have to give each line of code a number, like 10, 20, and 30. This tells the computer the order of your instructions. But the computer will not start the list of instructions on its own. You have to type the word RUN and hit enter. This command acts like a starter pistol. It tells the brain of the computer to start at the lowest line number and follow your instructions step-by-step until the end.