Charm that creates a magical barrier which deflects minor to moderate Hexes as well as any physical entities. Spells will sometimes rebound off it directly back towards their caster. Other times they will ricochet off in other directions or dissipate as soon as they hit the shield, or around the caster's sides. It will not repel any effectively cast Unforgivable Curses The incantation for this spell is Protego.
Bright colors, mixed.
Harry Potter and the Goblet of Fire
Harry Potter and the Order of the Phoenix
Harry Potter and the Half-Blood Prince
Harry Potter and the Deathly Hallows