Changing gamemodes in Minecraft might be considered cheating in some cases, but it can allow players to do a variety of things mid-game.

Spectator mode is a special Minecraft game mode through which players can go through solid blocks and see all openings present in the world, be it caves, structures, and other features.

In "Minecraft's" Creative or Spectator modes, you can fly by double-tapping the jump button, but in Survival mode, you'll need to find an Elytra.