Wooden trapdoors are horizontal barriers which can be opened and closed by hand or a redstone signal. They occupy the upper or lower part of a block, depending on how they have been placed. When open, they can be climbed like a ladder.=
To open or close the trapdoor, rightclick it or send a redstone signal to it.=
Iron Trapdoor=
Iron trapdoors are horizontal barriers which can only be opened and closed by redstone signals, but not by hand. They occupy the upper or lower part of a block, depending on how they have been placed. When open, they can be climbed like a ladder.=