In the final book, “Harry Potter and the Deathly Hallows,” Rowling reveals that Snape was acting on Dumbledore's orders and had protected Harry at school out of love for Harry's mother, Lily. “Snape died for Harry out of love for Lily,” Rowling said.
While through most of the series Snape seems to be horrible to Harry and possibly trying to get him into Voldemort's hands, it's revealed at the end of the series that Snape was actually helping watch out for Harry.
The truth came out when Professor Quirrell admitted to Harry that he'd jinxed the broom and claimed he'd have gotten away with it too if it hadn't been for those meddling counter-curses. In other words, Snape tried to save Harry's life, and the only thanks he got was being set on fire.
He would always resent Harry for being James' son instead of his. Snape even said that he didn't want anyone to find out that he was protecting Lily's child, “especially Potter's son” (pg. 679 of Harry Potter and the Deathly Hallows) because of his hatred for James.
1) Snape does an incantation ( counter curse ) during the first ever quidditch match, saving Harry from Quirrell who was trying to jinx the broom. He referees the next match to prevent Quirrell from trying any more shenanigans ( He has NEVER done that before or since ).
As Rowling explained in a series of tweets, Snape loved Harry's mother, Lily, and his unrequited affection drove him to resent Harry's father, James — and by extension, Harry himself.
With Harry and Hermione despondent after the events in Godric's Hollow and Ron trying desperately to find his way back to them, it was Snape's Patronus – the Silver Doe that was somehow familiar to Harry, perhaps because it recalled his mother's own Patronus – that brought them back together.
The acclaimed author explained that Harry paid tribute to Snape because of “forgiveness and gratitude.” Though Snape bullied Harry, he also saved him. “Harry hoped in his heart that he too would be forgiven.
Snape calls Lily a Mudblood, Lily tells James that she would never date him because he's an egotistical jerk. Later, Snape tries to apologize for calling Lily a Mudblood, but she's not interested; she ends their friendship due to his association with Death Eaters.
He doesn't trust Snape as Dumbledore does, but he believes that he can detect any disloyalty. Moreover, Voldemort regards Snape as highly intelligent and therefore ' as a true Slytherin ' a person whose top priority is to take care of himself. To his twisted mind, selfless equals stupid.
"The first thing Snape asks Harry is "Potter! What would I get if I added powdered root of asphodel to an infusion of wormwood?" According to Victorian Flower Language, asphodel is a type of lily meaning 'My regrets follow you to the grave' and wormwood means 'absence' and also typically symbolised bitter sorrow.
Snape's secrecy is revealed to have been a mask and he has sacrificed being well-liked to be able to save Harry, all because of his love for Harry's dead mother: the only friend Snape ever had.
Voldemort intentionally made six Horcruxes, but when he used Avada Kedavra on Harry, he unintentionally created a seventh Horcrux. Instead of dying, Lily's love for Harry created a counter 'curse' known as Sacrificial Protection and saved Harry.
Dumbledore reveals how thoroughly he loves Harry. Harry is brave, and Dumbledore is proud as any father would be. More than that, Dumbledore succumbs to a parent's weakness; he cares more about Harry's happiness and wellbeing than the wizarding world he is trying to protect.
Snape's love for Lily fed his hatred for James, and meant he would stop at nothing ' even arranging the murder of her child ' to possess Lily. Lily's life would be spared in return for Snape giving information of the prophesy to Lord Voldemort.
The night Quirrell let the troll in is when Snape got bit because he was trying to stop him from getting past the dog.
Harry Potter named his son after the character Professor Severus Snape in tribute to him dying for “for Harry out of love for Lily [Potter],”JK Rowling revealed on Friday.
And although she was one of the few people at Hogwarts who was entirely unimpressed by him, her fellow Gryffindor James Potter was also deeply infatuated with her as well. Obviously Lily ultimately chose James Potter over Severus Snape, and Lily and James got married and had their only child, Harry Potter.
So Snape asked Voldemort to spare Lily. He basically rejected this request out of hand; killing the Potters was too important to him. He agreed to give Lily a chance to save herself, but he certainly didn't promise to save her life. Voldemort was actually true to his word when he said that he'd give Lily a way out.
Voldemort did get to know about Snape's betrayal. Harry himself tells him right before their final showdown. This is their final dialogue: "I brought about the death of Albus Dumbledore!"
There is no evidence to show that Voldemort ever knew Snape had betrayed him by revealing his plans to Dumbledore; on the contrary, there is a fair amount of circumstantial evidence to indicate that he didn't.
"I regret it," said Voldemort coldly. When Voldemort finally works out the truth about the Elder Wand (albeit incorrectly) he sends Lucius to fetch Snape and then confronts him before killing him off. He confesses his apparent “regret” for having to kill him, twice.
1 Albatross
As the rarest Patronus in the Wizarding World possible, the Albatross represents an enormous bird that flies freely across any sea. This rare Patronus represents those who are simultaneously fearless, optimistic, happy-go-lucky, and ambitious.
Similarly to Harry, Snape's patronus represents a person. In the memories he gives Harry before his death, Snape shows Dumbledore his patronus, using the form to prove his love of Lily Potter, Harry's mother. This indicates that Lily also had a doe patronus.
The reason that Lilly's death was a true sacrifice (as in she died though she needn't have) is the fact that Voldemort genuinely would have let her live if she had stepped aside and let him kill Harry. Snape convinced Voldemort to spare Lilly.