Charge is a property of all matter. There are two types of charge, positive and negative. Charges of the same type repel each other, and charges of different types attract each other.
Atoms contain both positive and negative charges, and in most bodies the number of positive charges is equal to the number of negative charges. The effects cancel, so the body has zero net charge and is said to be neutral.
You can see charge at work when a charged rod attracts small pieces of paper, bends a thin stream of water, or when a charged balloon sticks to a wall. Two charged rods will push apart or pull together, depending on whether their charges are alike or different.