The 3 unforgivable curses

Voldemort-spell-avada-kedavra-harry-potter-14771461-500-335.jpg 3 unforgivable curses
The unforgivable curses are the most powerful and deadly spells in the wizarding world so far. "He who must not be named" uses these spells. There are three unforgivable curses in Harry Potter; the Cruciatus Curse, The Imperius Curse and The Killing Curse. If you were to be caught using these curses, it would win you a 1 way ticket to Azkaban.

The Cruciatus Curse
The Cruciatus Curse's spell is "Crucio". It inflicts excruciating pain and suffering on the recipient of the curse, or as muggles say, tourtues them. Voldemort, for instants, used this curse on Harry in The Goblet Of Fire in the graveyard. This is the curse which the death eaters use the most, just for pure enjoyment and suffering on their recipient.

The Imperius Curse
The Imperius Curse's spell is "Imperio". It causes the victim to do whatever the wizard or witch wants it to do, from walking or talking, to the most unforgivable things in the wizarding world. Barty Crouch jnr. used this curse on Viktor Krum in The Goblet Of Fire. Resisting the Imperius Curse is possible, but very difficult. Only those who are extremely strong can achieve this. Harry Potter learned to resist it after being subjected to its effects.

The Killing Curse
The Killing Curse's spell is "Avada Kedavra". It causes instant death. Casting the killing curse sends a green blinding bolt out the end of the caster's wand. If it directly hits the victim, instant death will come upon them. The Killing Curse has no blocking attack, and is almost impossible to dodge. The only wizard known to survive the Killing Curse is Harry Potter, after surviving from when Voldemort used it on him when he was only a baby. Voldemort uses this curse most commonly, and used it to kill Lily and James Potter. Snape also used this to kill Albus Dumbledore.