Child Link:
Agile and small, Child Link can access areas Adult Link cannot. He uses the Kokiri Sword and Deku Shield. His primary ranged weapon is the Fairy Slingshot. He's essential for solving puzzles that require his smaller stature or specific items like the Boomerang.
Adult Link:
Stronger and more experienced, Adult Link wields the Master Sword and Hylian Shield. He gains access to powerful items like the Fairy Bow, Megaton Hammer, and Longshot. His combat style is more direct and powerful. Switching between the two forms is a core mechanic of the game.