A variable is a convenient placeholder that refers to a computer memory location where you can store program information that may change during the time your script is running. In VBScript, variables are always of one fundamental data type, Variant.
Dim Top, Bottom, Left, Right
You can also declare a variable implicitly by simply using its name in your script. That is not generally a good practice because you could misspell the variable name in one or more places, causing unexpected results when your script is run. For that reason, the Option Explicit statement is configured by default in the Global Procedures interface to require explicit declaration of all variables. Unless you delete this statement, you need to declare all variables explicitly; otherwise, VBScript will generate errors during runtime indicating that the variable does not exist.
MyVar = 100