Interview Questions

Event delegation attaches a single listener to a common ancestor instead of many listeners on individual children. Events bubble up, and you inspect `event.target` to act on the originating element. It reduces memory use and works for dynamically-added elements.

A closure is a function bundled with references to its surrounding lexical scope, retaining access to those variables after the outer function returns. Practical uses: data privacy (module pattern), function factories, and maintaining state in callbacks.