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Memory is measured in Bytes and muliples of bytes. A Megabyte is one million bytes. A Giga byte is a thousand Megabytes or 1,000,000,000 bytes.

A byte is a group of binary digits called 'bits', mostly 32bits to the byte, in modern computers.

Each byte is capable of representing a number.

Each byte can be looked at, retreived or changed, by an address at any time. This is called random access. ie You can access it without having to pass through other locations (like a tape). For this reason it is called Random Access Memory, or RAM.

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