What is the difference between argument and parameter?

Answer 1

Arguments the values you pass to the function when you are calling it.
Parameters are local variables that are initialized with the values passed as arguments when a function is called.
I.e.: parameters are values that a function need to do its job, and these parameters will have the values of the arguments you passed when you called the function.

Answer 2

consider a function, int func(int x,int y) - in this kinda situation, x and y are parameters ! But within main function when you're actually calling the func then whatever may be the data you're going to enter act as arguments!