A constant is a meaningful name that takes the place of a number or string that will never change. VBScript defines a number of intrinsic constants. For example, const pi = 3.14. The Empty keyword is used to indicate an uninitialized variable value.
VBScript has only one data type called a Variant. A Variant is a special kind of data type that can contain different kinds of information, depending on how it is used. Because Variant is the only data type in VBScript, it is also the data type returned by all functions in VBScript.