Byte cells in physical RAM (Random Access Memory) are sequentially numbered starting at 0. The index number of a cell it called its address. At the machine code level the computer examines numbers in cells, and stores numbers in cells using their addresses to keep track of what information it keeps where. Sometime groups of cells are ganged together, e.g. 4 cells to form an int. In Intel CPUs (Central Processing Units) the low order byte comes first. This is called little-endian order. In IBM (International Business Machines) mainframes the high order bite comes first. This is called big-endian order. In either case, the first byte is considered the address of the group. Now-a-days programmers rarely get involved with addresses (usually specified as hexadecimal (base 16) numbers). Debugging and programming tools allow programers to assign easy-to-remember names to various addresses and use those instead.
Address can also refer to a mailing street address. It is formed of such things as apartment number, street number, Street name, street direction, street type (avenue/street etc.), city/town, State/Province, country and postal code. Unfortunately every country has its own format. They put the fields in different orders. The postal code is sometimes made of two parts. I have long advocated that an international street address should be treated almost like an atomic type, with the details of input, validation, printing, sorting and display (including cross checking postal code with other parts of the address) should not be the domain of application programs. I am sure this will get sorted out and perfected just as electric communication and courier services using GPS (Global Positioning System) coordinate addresses have obsoleted snail mail delivery.
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