Do terms "event handler" and "event listener" have any difference?

[alattalatta]

There are many pages which both terms are present, sometimes even within a single paragraph. IMO it would be better to stick with one to reduce any chance of confusion, but before that, do they differ in their actual meaning, even if little?

"Listening" and "handling" are indeed not equal, but EventListener interface defines handleEvent method, which... handles events. This also matters in localizing docs: Should I preserve listener and handler, or is it on me to decide?

[hamishwillee]

From MDN

Event handlers are sometimes called event listeners — they are pretty much interchangeable for our purposes, although strictly speaking, they work together. The listener listens out for the event happening, and the handler is the code that is run in response to it happening

IMO they should be preserved, unless they are used incorrectly. Most of the time in "Learn" we'll be talking about the handler since that is the code that actually gets run.