What is referred to as a "Bus" in relation to a video switcher?

In the context of a video switcher, a "bus" specifically refers to a row of buttons that allows the operator to select different video sources. This configuration enables the seamless switching between multiple inputs during a live production or post-production editing. Each button on the bus corresponds to a specific video input, making it easier for the operator to make quick changes and manage transitions between various feeds, whether they be cameras, graphics, or other video sources.

This functionality is crucial during live broadcasts, where timing and precision in switching sources can significantly impact the overall production quality. By having a centralized control mechanism like a bus, operators can execute complex transitions smoothly and efficiently, enhancing the viewer's experience.