Professor Severus Snape was a Death Eater who became a double agent and a member of the Order of the Phoenix, headed by Albus Dumbledore. Although many believed Snape was actually working for Voldemort, Dumbledore trusted him for reasons no one could figure out.
He began teaching Potions at Hogwarts, although he always wanted the post of Defence Against the Dark Arts. As a teacher, he and Harry harbored a fierce hatred of each other.
After Lord Voldemort's return in 1995, Albus Dumbledore ordered him to go back to Lord Voldemort and act as a spy for him. Voldemort accepted Snape back, believing that Snape had been gathering valuable information for him at Hogwarts when he was away.
In the 1995-1996 school year at Hogwarts, Severus remained in his post as Potions Master. In winter, Snape was appointed by Albus Dumbledore to teach Harry Potter Occlumency.
In 1996, Narcissa Malfoy, accompanied by her sister, Bellatrix Lestrange, went to Severus's House in Spinner's End. Narcissa came to ask for help, she asked in Severus could "look over" Draco. Narcissa and Severus made the Unbreakable Vow.
In 1996-1997 school year at Hogwarts, Severus Snape was assigned the post of Defence Against the Dark Arts teacher, the job which he had been applying for since he first joined the Hogwarts staff.
In Spring 1997, several Death Eaters secretly entered Hogwarts through the Vanishing Cabinet in the Room of Requirement. They cornered Albus Dumbledore on the Astronomy Tower. Draco Malfoy was under orders from Lord Voldemort to kill Albus Dumbledore, Draco was unable to do so. Severus Snape killed Albus Dumbledore instead, cementing his position as one of Lord Voldemort's most trusted Death Eaters.
In 1997, Severus Snape was appointed Headmaster at Hogwarts after the Death Eaters invaded the Ministry of Magic and took control of it.
In May 1998, The Battle of Hogwarts broke out. Which resulted in Lord Voldemort killing Severus over the Elder Wand, a wand which was believed to be unbeatable. In his final moments, Harry Potter came across Snape, and Snape showed Harry memories of his past, revealing that because of his deep love of Lily Evans, Harry's mother, he had been acting under Albus Dumbledore's orders the whole time and had been protecting Harry, but because of his hatred for James Potter, Harry's father, Snape abused and tormented Harry throughout the time he knew him.
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