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Memory and Addressing Modes
Memory address modes determine the method used by a running program to access its data or next instruction. Memory includes the internal registers of the CPU as well as external RAM. Some memory modes are suited to access the registers whilst other memory modes are better at accessing external RAM.
In computing, a memory address is a reference to a specific memory location used at various levels by software and hardware. Memory addresses are fixed-length sequences of digits conventionally displayed and manipulated as unsigned integers. Such numerical semantic bases itself upon features of CPU (such as the instruction pointer and incremental address registers), as well upon use of the memory like an array endorsed by various programming languages
(Above) In a computer using virtual memory, accessing the location corresponding to a memory address may involve many levels.