The Parameters which are sent from main function to the subdivided function are called as Actual Parameters and the parameters which are declared a the Subdivided function end are called as Formal Parameters
The distinction between actual and formal parameters is that real parameters are used to invoke or pass information while the program is running. Formal parameters, on the other hand, are declared when the function is called. The parameter written in the Function Definition is referred to as a “Formal Parameter.” Actual parameters do not have to be variables, but formal parameters are always variables. “Actual Parameter” refers to the parameter specified in the function call. Actual parameters can be numbers, expressions, or even function calls.