Megabyte (MB) - one megabyte is equal to 1,048,576 bytes (2 to the power of 20 bytes).

Megahertz (MHz) – 1MHz = 1 million hertz (1,000,000 Hz). It is a measure of wave frequency and is commonly used to describe the speed at which a computer's processor runs (known as the "clock speed").

Menu – A list of commands available for use in the program.

Merge – The combination or uniting of one file with another.

Message – A piece of mail that is sent from one user to another by an email or a chat program. It is also used to describe the information that is passed between applications and the end users.

Modem – This word is derived from MODulator/DEModulator, and is a device that allows digital information to be transmitted over an analog phone line.

Monitor –A computer device that displays information for the user to view and interact with.

Motherboard – The main board of a computer that contains circuits for the CPU, monitor, keyboard and other components such as BIOS, memory etc.

Mouse – A hand-held device that allows you to move in all directions of the computer screen and select operations or manipulate text or graphics.