The Goddess Sword is an item from Skyward Sword. A powerful sword, the Goddess Sword is used by Link in many ways during his quest. The Goddess Sword is inhabited by Fi, a spirit created by The Goddess herself. The Goddess Sword itself, is named after Her Grace, the Goddess.
The Goddess Sword has many abilities, some not seen in other weapons in the series. One of its powers is its ability to allow Link to travel between Skyloft and Hyrule. If Link holds the sword skyward; it will allow him to perform a Sword Beam. If Link slices a Goddess Cube with the Goddess Sword, the cube will be sent to the sky, opening a treasure chest. Unlike previous games, Link does not need full health to use a Sword Beam. The Goddess Sword allows Link to use a new ability called dowsing. While using dowsing, Fi will lead Link towards whatever item/person he chooses.
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The Goddess Sword was created by the Goddess, the same Goddess who created the spirit of the sword, Fi. Throughout the game, Link will tasked with turning the Goddess Sword into the Master Sword. It is done by the precious flames located in Ancient Cistern,Sandship, and the Fire Sanctuary. After that, it is blessed by the goddess to be able to achieve it's true form. The Master Sword is a constant reoccurring trademark in the Zelda series, suggesting it plays one of the biggest parts in The Legend of Zelda: Skyward Sword.