Description: An event handler function is a function that is called in response to an event or request. This concept is fundamental in event-driven programming, where user actions, such as mouse clicks or key presses, generate events that need to be managed by the software. Event handler functions allow developers to define how an application should react to different situations, providing a structured way to manage response logic. These functions are typically associated with user interface elements, such as buttons or forms, and can be used to perform tasks like validating data, updating the interface, or sending information to a server. The ability to define multiple handlers for different events on the same element allows for rich and dynamic interaction, enhancing the user experience. In programming languages like JavaScript, event handler functions are essential for developing interactive applications, where responding to user actions is crucial for functionality. In summary, event handler functions are key tools in modern programming, facilitating the creation of applications that effectively respond to user interactions.
