While Link carries many weapons and items on his quest, a sword is always equipped. The first sword he ever wielded he found in a box and he's totally been a master ever since. Totally.
Kokiri Sword
The first sword Link wields. He finds the Kokiri Sword in a secret area of Kokiri Forest and uses it throughout his entire childhood quest in OoT.
Master Sword
The evil-destroying sword. Link first sees the Master Sword when he opens the Door of Time, and, being the Hero of Time, he is able to pull it from its pedestal. This is the sword Link uses the most and is the only one that can deliver the final blow to Ganon.
Giant's Knife
A two-handed sword. The Goron in Goron City will make this sword for Link...for a price. However, hitting the Giant's Knife against a wall results in it breaking. Obtaining the Giant's Knife in OoT is optional, yet not recommended. (Who wants to pay that much money for a sword that breaks?)
Biggoron's Sword
The most powerful sword. After giving Biggoron his eye drops, he agrees to make Link a giant sword. While this sword takes off more than the Master Sword, it is too heavy to carry with one hand, meaning Link can't use his shield. Obtaining the Biggoron's Sword is optional in OoT.
Razor Sword
Double the power of the Kokiri Sword. In Termina, giving 100 rupees and his Kokiri Sword to the Mountain Smithy will gain Link the Razor Sword. Although stronger than the Kokiri Sword, the Razor Sword breaks after 100 hits and cannot be taken back in time.
Gilded Sword
Triple the power of the Kokiri Sword. In Termina, giving the Razor Sword and Gold Dust to the Mountain Smithy will gain Link the Gilded Sword. This sword is much stronger than the Kokiri Sword, never breaks, and can be taken back in time.
Great Fairy's Sword
A wide-range sword. If Link collects all 15 fairies from the Stone Tower and takes them to the Ikana Fairy Fountain, the Great Fairy will give him her sword. The Great Fairy's Sword is a C-button item and is very large, meaning Link cannot use a shield while wielding it.
Fierce Deity's Sword
A huge, twisted sword. Becoming the Fierce Deity automatically gives Link the ability to use this sword. Aside from being very powerful, it also has the ability to shoot energy at a boss.