| In computer programming, a filter is a program or section
of code that is designed to examine each input or output request for certain
qualifying criteria and then process or forward it accordingly. This term
was used in Unix systems and is now used in other operating systems. A filter
is "pass-through" code that takes input data, makes some specific
decision about it and possible transformation of it, and passes it on to
another program in a kind of pipeline. Usually, a filter does no input/output
operation on its own. Filters are sometimes used to remove or insert headers
or control characters in data. |
