Address constant

An address constant is a special type of number that is assigned to a location in a computer's memory. This number tells the computer where to store information, so it knows where to find it later. Address constants are usually used when a program needs to access information that is stored in the same place all the time. Think of it like mailing someone a letter - you know the address is the same every time, so you just need to know that address without it changing. That's the same with address constants - the number doesn't change, so it's easy to find data in a computer's memory.