Define the Parameter Passing Mechanism - Computer Programming?

The Parameters are syntactically identifiers and they are used within the body of the function and sometimes the parameters in a function definition are called as formal parameters to emphasize their role as placeholders for actual values that are passed to the function when it is called. Upon function invocation the value of the argument match up to a formal parameter is used within the body of executing function before beginning with the statements in the functions, it is necessary to declare the type of the arguments through type declaration statements.