A video switcher is a device used in live video production to select and switch between different video sources. These sources can include cameras, graphics, and pre-recorded videos. Video switchers allow operators to create a seamless viewing experience by transitioning between these sources in real-time, making them essential for events like live broadcasts, concerts, and sports events. In addition to switching video sources, many video switchers offer features like video effects, transitions, and audio mixing. They can be operated manually or through software, providing flexibility for different production needs. Overall, video switchers play a crucial role in enhancing the quality and professionalism of video presentations.