What is Parameter and why we use it

Parameters are the instance of a function so that the function can do something with it and may produce some output. Like a real world example of making a cup of tea you need four things tea,milk,sugar and water so here these are the parameters for Making_Tea() function.

For a code example

main()
{

printf("We are producing %d cup of tea",making_tea(1,2,3,4));
getch();

}
int making_tea(int param1,int param2, int param3, int param4)
{

int output;
output=param1+param2+param3+param4;

return output;
}