Conveyor Blocks are moving blocks that can move anything except obsidian, bedrock or Darkness, in whatever direction it is facing.
( P - Piston, SP - Sticky Piston, RS - Redstone, CS - Cobblestone )
Conveyor Block -
Sticky Conveyor Block -
The difference between Conveyor Blocks and Sticky Conveyor Blocks is that normal ones just take the player to where-ever they are facing and sticky one keep the player stuck on them, useful for traps.