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A '''piston''' is a [[block]] capable of pushing most [[entities]] and blocks when given a [[redstone]] signal.
Some blocks cannot be moved, break when pushed or have other interactions with pistons. A piston can move up to twelve blocks at once.
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Sticky pistons stick to a block only when retracting, so a block next to the piston head can be pushed aside by another piston and sticky pistons cannot hold falling blocks horizontally against gravity. {{IN|je}}, pistons finish extending early and start retracting if given a pulse shorter than 3gt (when it has [[#Start delay|start delay]]) or 2gt (when it doesn't have start delay). These shorter pulses cause sticky pistons to "drop" their block, leaving it behind when trying to push it with a short pulse. Also, this causes the block to end up in its final position earlier. However, if they receive a short pulse and don't have a block to be pushed, they pull the block which is 1 block away. }}
A piston that pushes a [[slime block]] bounces any entity that it displaces in the direction the piston is facing. In addition, when a slime block is moved by a piston, any movable blocks adjacent (not diagonally) to the slime block also moves. See the [[#Slime blocks and honey blocks]] section below for more details.▼
▲bounces any entity that it displaces in the direction the piston is facing. In addition, when a slime block is moved by a piston, any movable blocks adjacent (not diagonally) to the slime block also moves. See the [[#Slime blocks and honey blocks]] section below for more details.
{{IN|bedrock}}, blocks that stick to walls (such as levers) can be placed on pistons without being destroyed when activated.
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