Goddess Sword

The Goddess Sword is a sword from The Legend of Zelda: Skyward Sword. The Goddess Sword's primary purpose is aiding Link in fulfilling his role as the chosen hero. When pointed skyward, the sword can charge up and deliver a Skyward Strike, a ranged attack that has the power to activate various artifacts Hylia left behind for the Hero. The sword is inhabited by a sentient being known as Fi, who aids Link in his quest but it is unclear of what the difference is between the Goddess sword and the Master sword is

Story
Link   finds the Goddess Sword enshrined within a chamber found inside the Statue of the Goddess in Skyloft, led there by Fi. Throughout the course of the game, the Goddess Sword must be tempered with the three Sacred Flames of the Golden Goddesses, hidden away in dungeons on The Surface. This allows the Goddess Sword to transform and unlock new powers: Farore's Flame, found inside the Ancient Cistern, transforms it into the Goddess Longsword, which increases damage dealt and makes the blade longer. Nayru's Flame, found aboard the Sandship, transforms it into the Goddess Whitesword, improving its capacity for dowsing.

Lastly, Din's Flame, found within the Fire Sanctuary within Eldin Volcano, transforms it into the Master Sword. Eventually, the Master Sword receives the blessing of the Goddess Hylia, reincarnated as Zelda, ultimately becoming the legendary "Blade of Evil's Bane", to be wielded only by the chosen hero.