VBScript has five keywords corresponding to specific values ??for the variables.
The Empty the keyword
The Empty the keyword corresponds to the uninitialized state of a variable, that is to say that the variable exists but does not yet have a value.
dim MyVariable 'uninitialized variable
MyVariable="toto" 'variable initialized with the string "toto"
x=empty 'uninitialized variable
The Null keyword
The Null keyword, is not to be confused with Empty keyword. It corresponds to a value of an invalid variable.
The Nothing keyword
The Nothing keyword, when assigned to a variable (or more generally an object) can destroy it, and then release the resources used.
The keywords True and False
The keywords True and False are boolean values??, that is to say, they are used in conditional operations whether a condition can either be true or false. True corresponds to the value 1. False corresponds to the value -1.