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describe what an event listener is in computer programming.
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an event listener is a programming concept that allows a computer program to respond to user input or other events that occur in the system. it works by registering "listener" functions which will be called whenever a specific event occurs, such as when a user clicks a button or another program launches a specific process. event listeners are often implemented using callbacks as they allow a program to wait for an event to occur and then execute an action in response.
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