Salesforce JavaScript Developer Practice Exam

An event listener in JavaScript is a function that waits for a specific event to occur on a certain element, such as a mouse click, key press, or other user interactions. The method that defines this behavior and attaches the listener to an element is `addEventListener()`. When you use `addEventListener()`, you specify the type of event you want to listen for and provide the function that should be executed when that event occurs. This allows for a dynamic and interactive user experience.

The other options have different roles. For example, `createEvent()` is used to create a new event object but does not actually set up an event listener. `dispatchEvent()` is utilized to trigger an event programmatically, but it also does not involve listening for events. Similarly, `removeEventListener()` is used to remove an event listener that has previously been added. While all of these methods are related to event handling in JavaScript, `addEventListener()` is the specific method used to set up an event listener.