Need XP fast in survival? This tutorial shows you how to build the easiest mob XP farm in Minecraft 1.21+ — no spawner ...

This tutorial shows you how to build the easiest creeper/gunpowder farm in Minecraft 1.21+. No cats needed — this design ...

That said, it represents just one type of mob farm commonly constructed in Minecraft, and, despite its appearance, could even be considered one of the more humane ones.