extension
(1) An extra feature added to a standard programming language or system.
(2) In DOS and some other operating systems, one or several letters at the end of a filename. Filename extensions usually follow a period (dot) and indicate the type of information stored in the file. For example, in the filename EDIT.COM, the extension is COM, which indicates that the file is a command file. (Depending on the operating system, the punctuation separating the extension from the rest of the filename may or may not be considered part of the extension itself.)
Read Also:
- external bus
Another name for an external data bus.
- external command
In DOS systems, any command that does not reside in the COMMAND.COM file. This includes all other COM files, as well as EXE and BAT files. Commands in the COMMAND.COM file are called internal commands.
- external data bus
A bus that connects a computer to peripheral devices. Two examples are the Universal Serial Bus (USB) and IEEE 1394. Contrast with internal data bus. The bit width of internal and external data buses are not always equal.
- External Hard Drive
A hard drive that is outside of the computer case in its own enclosure. Most external hard drives support the IDE interface and are slightly bigger than a hard drive itself. When purchasing an external hard drive you can buy a full external hard drive system that consists of both the hard drive and the […]
- external modem
)A modem that resides in a self-contained box outside the computer system. Contrast with an internal modem, which resides on a printed circuit board inserted into the computer. External modems tend to be slightly more expensive than internal modems. Many experts consider them superior because they contain lights that indicate how the modem is functioning. […]