In a Minecraft world with cheats turned on, many players who find mob spawners will break them, obtain that same spawner via commands, and place them wherever they please.

Learn how to build the easiest spider spawner XP farm in Minecraft 1.21+. This design works in Java and Bedrock Edition, and is perfect for survival players who find a cave spider or regular ...

They can be found in specific locations in the game. See Minecraft Education Edition here. In this article, players will learn how to find a mob spawner in Minecraft!

For anyone itching to check out the Trial Chambers before then, you can test them out through snapshots on Java Edition and beta testing on the Minecraft Launcher.