| Word | Description |
| Mailing List | A list of subscribers to a group, where all the subscribers receive their messages via email.I It may be used to distribute newsletters, product updates information, as a basis for discussions groups etc. |
| Managed bandwidth | An end-to-end service offered by a carrier between two locations. The user has no insight into the technology or route used. Rather, the service contract is framed in terms of an agreed capacity and performance characteristics between the two ends of the service. |
| Markup tags | Tags that are added to the data of a document in order to convey information about it, and define how the content is to be displayed. |
| mbps | Megabits per second (or millions of bits) – a measure of communications speed equivalent to 1024kbps. Broadband speeds are commonly measured in mbps, ranging from 0.25mbps (or 256kbps) through to about 100mbps. |
| Meta tags | Used in html page headers, they contain information about keywords and descriptions of the web page. Meta tags provide search engines with the information they require to catalogue sites, which allows users who are doing a search on keywords to find relevant web sites. |
| Middleware | Software that is used to manage the communication between a client program and a database, which is also transparent to the client. |
| Mirror site | An Internet site that duplicates the functionality and content of another site. |
| Modem | An electronic device that converts digital computer signals into analogue audio signals so data can be sent over existing telephone lines. The name is an abbreviation of modulator/demodulator. |
| Multimedia | Describes the use of media formats, such as video and text. |