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- Mac
Type of computer made by Apple Computers. 
- machine code
The set of all possible instructions made available by the design of a particular processor. These instructions operate on very basic items of data, such as bytes or even single bits. They may be given memorable names in the associated documentation, but can only be understood by the computer when expressed in binary notation. Machine code is very difficult to write without mistakes. In practice, machine-code programming is achieved by the programmer writing in assembly language, which is closely related to machine code. - machine readable
Describes data or instructions that can be entered directly into a computer without the need for any preparation. This data may be stored magnetically, for instance on a credit card or travel ticket, or possibly printed on paper which is also readable by humans. - magnetic ink character recognition (MICR)
Machine recognition of stylised characters printed in magnetic ink. It is very reliable, so it is suitable for purposes needing accuracy such as banking. The commonest application is the data printed on a bank cheque: the cheque number, the sort code and the account number. These characters are both machine and human readable. - magnetic tape
Magnetic tape (or just 'tape') storage is backing store which uses plastic tape coated on one side with magnetic material. Digital information is stored on the tape as a set of parallel tracks, which are written or read simultaneously. - mail server
A mail server manages the email for a network. It provides the users with email addresses, stores incoming emails until collected by users, and sends outgoing emails to their destinations. - mailbox
A term used in some email packages to describe the location where email is stored. Similar to a folder. - mailbox
The location on a host computer which stores a user's email. - mailing list
A list of email addresses to which messages are sent. Users can join or leave the mailing list by subscribing or unsubscribing. - mailto
An HTML tag used on web pages to create a link to an email address. - mainframe
Mainframe computer is the term for a large computer usually accessed from many (often several thousand) terminals. It is used mainly for large-scale data processing in businesses, such as managing central databases. - maintain
Ensuring a system continues to run smoothly, e.g. amending a program to deal with changed circumstances. - maintenance
Ensuring a system continues to run smoothly, e.g. amending a program to deal with changed circumstances. - management information system (MIS)
A management information system (MIS) provides understandable amounts of management-level information which individual users might need, e.g. summaries from larger collections of data. When data is collected it usually consists of large quantities of simple information and needs further processing before it is usable. This type of processed information may typically be used by managers as an aid to monitoring budgets, assessing sales targets or making business decisions. - manual
Doing a process by hand, rather than having it automated. - manual
A booklet which gives written instructions on how to use a program or system. - many to many
In database design, this indicates a relationship between two tables in which each tuple (or row) in the first table can be related to one or more tuples (or rows) in the second table, and vice versa. For example, a class can have many students; and each student can take many classes. - margin
The blank space surrounding the contents of a page. - mask
Used in graphics programs to hide a part of an image, e.g. by making it transparent. - master copy
The final version of a document or other file, from which copies are made.
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