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A filter driver is a type of software component in computer systems that acts as an intermediary between a higher-level application and the lower-level device driver or kernel-level hardware. It intercepts or "filters" data or function calls to modify, enhance, or redirect them before they reach the target device driver or application. Filter drivers are commonly used in the context of operating systems, particularly for Windows, to modify or enhance the behavior of devices and applications without modifying the underlying device driver or software itself.