Block is a Warrior skill that appears in The Elder Scrolls V: Skyrim
Block allows players deflect enemy melee and archery attacks to reduce or nullify damage. You can block with a shield or weapon. You can only block with a one-handed weapon if it is in your right hand and your left hand is empty. You cannot block if you are dual wielding weapons.
Blocking uses stamina and does not stop all damage. Enemy power attacks cannot be fully blocked but blocking will reduce their damage and staggering effects.
You can also use blocking to perform bash attacks. While holding (LT), tap (RT) to perform a Quick Bash which has a chance of staggering enemies. While holding (LT) also hold (RT) to perform a Power Bash to knock enemies. Bash attacks will use up stamina.