"The Summoning Charm is used to make an object fly from a particular place to the casters arms. The incantation for the charm is 'Accio'."
From the Story
Discovered in Book 4, Chapter 6, The Portkey
"Mrs. Weasley uses the Summoning Charm to find all the Ton-Tongue Toffees that Fred and George try to smuggle out of The Burrow. The toffees zoom out of all sorts of unlikely places, including the lining of George's jacket and the turn-ups of Fred's jeans."
Discovered in Book 4, Chapter 20, The First Task
"Harry uses the Summoning Charm during the First Task of the Triwizard Tournament to summon his Firebolt from the castle."