VapourSynth is a video processing framework that uses Python scripting to apply filters and transformations to digital video. It allows users to perform tasks such as resizing, deinterlacing, denoising, and color correction through customizable scripts. The software is designed to handle frame-accurate editing and works as a backend engine for video encoding and restoration workflows. It is often used in video archiving, post-production, and research where precise control over video manipulation is required.