A video capture card is a hardware device that allows you to record and stream video signals from different sources. It is widely used in gaming, streaming, and video production to capture video content from one device and send it to another, usually a computer, for recording or streaming.
The primary function of a capture card is to convert analog or digital video signals into a format that can be processed by a computer. This conversion enables the capture card to relay a video stream to a PC for processing and provide support as a pass-through that allows the video stream to display on a monitor