Input events are actions that occur when a user interacts with a device, such as a computer or smartphone. These events can include actions like clicking a mouse, pressing a key on a keyboard, or tapping a touchscreen. Input events are essential for user interfaces, as they allow users to communicate with software applications and perform tasks. When an input event occurs, the system captures it and processes it to trigger a response. For example, when a user clicks a button in a web browser, the input event signals the browser to execute a specific function, such as loading a new page or submitting a form.