An arrow is a pointed weapon that's shot with a bow. If you enjoy archery, you like to shoot arrows at a target.
A bow consists of a piece of wood, metal, or plastic that has a flexible string connected to each end, and an arrow is the smaller, sharp-ended projectile that's held as the string is stretched back. When the string is released, the arrow flies. The Old English source of arrow is earh, which most likely comes from an Old Norse root.