An EventListener is a programming construct that waits for specific events to occur in a software application. When an event, such as a mouse click or a key press, happens, the EventListener responds by executing a predefined function or action. This allows developers to create interactive and dynamic user interfaces. In web development, EventListeners are commonly used in conjunction with the Document Object Model (DOM) to enhance user experience. For example, when a user clicks a button, an EventListener can trigger a function that displays a message or updates the content on the page, making the application more engaging and responsive.