Breath of the Wild takes place at the end of the Zelda timeline in the kingdom of Hyrule. Protected by four enormous animalistic machines called the Divine Beasts and an army of autonomous weapons called Guardians.
The kingdom of Hyrule had since regressed to a medieval state. Reading their ancestors' prophecies, the Hylians recognized the signs of Ganon's return and excavated surrounding areas to uncover the Divine Beasts and Guardians.
However, Ganon possessed the Guardians and Divine Beasts, turning them against Hyrule. King Rhoam and the Champions were killed, the castle town was destroyed, and Link was gravely wounded while defending the Hyrulean Army's only remaining base, Fort Hateno.
100 years after being placed in a healing chamber in the Shrine of Resurrection, an amnesiac Link awakens in a now-ravaged Hyrule.
After obtaining the Master Sword from the Lost Woods, Link enters Hyrule Castle and defeats Ganon with the help of the Divine Beasts and Zelda's Bow of Light. Zelda seals Ganon away, restoring peace and allowing the spirits of King Rhoam and the champions to depart to the afterlife.
If players have found all 13 memories in the quest "Captured Memories", they unlock a secret ending.