A video switcher is a device used in live video production to select and switch between different video sources. It allows operators to control which video feed is displayed on screen, making it essential for events like live broadcasts, concerts, and sports events. Video switchers can handle multiple inputs, such as cameras, graphics, and pre-recorded videos, enabling seamless transitions. These devices come in various forms, from simple hardware units to complex software applications. Many modern video switchers also include features like video effects, audio mixing, and streaming capabilities, enhancing the overall production quality and allowing for more creative presentations.