Darth Vader is the antagonist in the Star Wars Saga. His name was Anakin Skywalker. After being slaved on Tatooine is lured to the dark side becoming the Sith Lord.
With the lightsaber battle versus Obi-Wan Kenobi, Vader is transformed into a cyborg, due to severe burns and dismembering.
During the saga we discovered that Vader is Luke Skywalker’s and Princess Leia’s father, therefore Kylo Ren’s grandfather.