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In signal processing, a **filter** is a device or algorithm that processes a signal to remove unwanted components or features, or to extract useful information. Filters are essential tools in various fields, including audio processing, communication systems, image processing, and data analysis. Filters can be categorized based on several criteria: 1. **Type of Filtering**: - **Low-pass filters**: Allow signals with a frequency lower than a certain cutoff frequency to pass through while attenuating higher frequencies.