The `start()` function is commonly used in programming to initiate a process or a program. When called, it signals the system to begin executing a specific set of instructions. This function is essential in various programming languages and frameworks, as it helps manage the flow of operations, ensuring that everything runs smoothly from the beginning. In the context of JavaScript, for example, `start()` might be used to kick off an animation or a game loop. By calling this function, developers can create engaging experiences for users, allowing them to interact with web applications or software seamlessly.