omg what school you going to?

inString would be a varible that you would declare somewhere b4 you use it in the:
cin>> inString //statement

i.e.

string inString; //Now memory is allocated for the user to input a string of characters, not including spaces, (you'll learn how to handle white spaces later, with a simple function)....

//Now you can use the memory to store the users input...

i.e.

cin >> inString;