Explain™ allows you to store data in variables. Whenever you have variables (and what computer language would be useful without them?), you need to be aware of three issues:

For example, consider the simple Explain assignment statement:

A = 1

The A refers to a variable in which we have stored a value of 1. Later on we can use the data in A:

B = A

Now A and B both contain the value 1.

There are three data-storage categories for variables: