Elrond is indeed a half-elf. He is the son of Earendil the Mariner, a legendary figure who played a crucial role in shaping the history of Middle-earth. His mother is the Maia Elwing, a powerful immortal being. As a result of his mixed heritage, Elrond possesses both the resilience and strength of a human and the wisdom and longevity of an elf. He is known for his exceptional leadership, diplomacy, and knowledge, making him a central figure in the fight against Sauron and the preservation of Middle-earth's magical realms.