The Shield Bash is a skill from The Legend of Zelda: Skyward Sword. Link can use this technique to parry an enemy's attack with his shield, often causing the enemy to recoil, lowering its guard and providing an opening for an attack. It will also prevent Link from recoiling from a powerful attack, allowing for further defence or a counterattack. The Shield Bash is also capable of reflecting projectiles and energy beams.
The Shield Bash's successful use prevents the Shield Gauge from depleting, extending the life of Link's shield. It is also useful against certain bosses. Interestingly, if Link uses this skill with perfect timing, Link can block a fire attack with the Wooden Shield, or an electric attack with the Iron Shield, without it being destroyed. Link can also block some attacks with his sword, but this requires specific timing.
Link can parry melee and projectile attacks with any shield though doing so successfully results in a Perfect Guard which causes Link's perception of time to slow and knocks the enemy back for melee attacks while not effecting the shield's durability. Projectiles and Guardian beams will be reflected and doing so successfully will not effect a shield's durability. Parrying with a Lynel Shield, Mighty Lynel Shield, or Savage Lynel Shield can cut grass and even damage enemies due to the shields' blades.
Link's counter attack looks and functions similar to the Shield Bash.