Who is Elendil from The Silmarillion and what is their importance?

Elindil, the Tall, is the son of Amandil and the last lord of Andenie in Numenor. He is a descendent of Earendil and Elwing. He escapes with his sons, Isildur and Anurion, from the destruction of Numenor and founds the Numenoreans realms in Middle-earth. Elendil, along with Gil-galad is slain when they overthrow Sauron at the end of the Second Age. Elindil means Elf-friend or Star-lover.