+A **filter** is a device or process that selectively passes or blocks certain elements from a larger whole. It refines a [signal](/wiki/signal) or [data](/wiki/data) stream, allowing desired components to emerge while undesired ones are suppressed or removed.
+## See also
+- [Processor](/wiki/processor)
+- [Spectrum](/wiki/spectrum)
+- [Algorithm](/wiki/algorithm)
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