What is VBScript function procedure?

A Function procedure is a series of statements, enclosed by the Function and End Function statements.It can perform actions and can return a value.It can take arguments that are passed to it by a calling procedure,without arguments, must include an empty set of parentheses ().Itreturns a value by assigning a value to its name.
Example:
 (1)Function myfunction()
  some statements
  myfunction=some value
End Function

(2)Function myfunction(argument1,argument2)
  some statements
  myfunction=some value
End Function