Something is recorded if it's been taped, filmed, or written down, like a recorded copy of your cousin's graduation. Yawn.
Things that have been taped on an audio device might include a recorded podcast or a recorded interview for your school's radio station. And unless it's a live event, the shows you watch on TV are recorded programs. When official notes are taken, they're recorded too: "This is the hottest summer in recorded history." The Latin root of recorded and the verb record is recordari, "remember by heart."