Computing
In computing:
- Filter (higher-order function), a higher-order function that processes a data structure (typically a list) in some order to produce a new data structure containing exactly those elements of the original data structure for which a given predicate returns the boolean value true
- A program to process a data stream:
- Filter (software), a computer program to process a data stream
- Filter (Unix), a program that gets most of its data from its standard input (the main input stream) and writes its main results to its standard output (the main output stream)
- Filter (video)
- Email filter
- Internet filter
- Wordfilter, a script typically used on Internet forums or chat rooms that automatically scans users' posts or comments as they are submitted and automatically changes or censors particular words or phrases
- BPF filter expression used in the qualification of network data
- DSL filter, a low-pass filter installed between analog devices and a telephone line
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