Minecraft wiki entry for Player, associated text: Sneaking is a feature activated by pressing and holding the sneak key (default is ⇧ Shift). Sneaking prevents players from falling more than half a block, making it highly useful for building horizontally outward over space. Going past the edge of a block and stopping sneaking, does not result in falling off that block. Additionally, the player can still dismount blocks while sneaking by jumping over the block's edge. In Multiplayer Mode, a player's name tag will be grayed out (in Java Edition) or completely disappears (in Bedrock Edition} when they sneak, to relate to the fact that sneaking will make you harder to see.