nAll integers, floating-points, strings and other values used in a program are stored in and retrieved from the memory unit. Conceptually, individual memory locations in the memory unit are arranged like the rooms in a large hotel. Like hotel rooms, each memory location has a unique address (“room number”). n A variable is simply a name (or an identifier) chosen by the programmer that is used to refer to computer storage location. The term variable is used because the value stored in the variable can change, or vary.