Lord Voldemort (born Tom Marvolo Riddle) is a fictional character in the Harry Potter series of children's books. The books were written by J.K. Rowling. Voldemort first appears in the 1997 fantasy novel Harry Potter and the Philosopher's Stone.
In the world of Harry Potter, some people are wizards and can do magic. They have their own hidden society and government. Ten years before the book begins, Voldemort and his followers tried to take over this "wizarding world". Voldemort killed Harry Potter's parents. Voldemort also tried and failed to kill Harry Potter, but Harry was protected by a powerful spell. Voldemort's body was destroyed but his soul survived and stayed in the world. A lot of people thought that he was dead. Voldemort then takes the body of Professor Quirell and tries to steal the Philosopher's Stone to get a body back and become immortal. Harry stops him. In the 1998, sequel Harry Potter and the Chamber of Secrets it is revealed that Voldemort was once called Tom Riddle. In the 1999 sequel Harry Potter and the Prisoner of Azkaban it is revealed that Harry's parents were warned about Voldemort so they went into hiding and only told their friend Peter Pettigrew where they were but Voldemort threatened to kill Pettigrew so he betrayed the Potters and Voldemort killed them. In the 2000 sequel Harry Potter and the Goblet of Fire Pettigrew creates a new but dying body for Voldemort keeping him alive by feeding him the venom of his snake Nagini. Voldemort kidnaps Harry Potter kills Harry's friend Cedric and steals a bone from his father's grave, cuts off Pettigrew's hand and takes a drop of Harry's blood to create a potion that he uses to bring himself back. In the 2003 sequel Harry Potter and the Order of the Phoenix it is revealed that there was a prophecy that Harry would one day have the power to beat Voldemort so Voldemort decided to kill him. Voldemort killed Harry's father and then tried to kill Harry by casting a spell. But Harry's mother jumped in front of him and died to save his life. Because of her sacrifice Voldemort's spell destroyed Voldemort instead of Harry. In the 2005 sequel Harry Potter and the Half-Blood Prince Voldemort declares war to take over the world and has Albus Dumbledore killed. In the 2007 sequel Harry Potter and the Deathly Hallows Voldemort wants to find a wand which can kill Harry. Voldemort kills several people to get it. Harry finds out that Voldemort back when he was Tom Riddle put parts of his soul in objects called Horcruxes to make himself immortal. Harry finds and destroys all surviving Horcruxes except for the snake Nagini. Voldemort tries to kill and believes that he succeeded. Then Harry's friend Neville Longbottom kills Nagini and Harry fights Voldemort. Since the wand Voldemort stole now belongs to Harry, Harry beats Voldemort and kills him.