Viking ships came in a variety of sizes and types, each suited for different purposes. The drekkar was a longship used by warriors for raids, with features like a shallow draft, light weight, and space for up to 60 rowers. The knorr was a larger merchant ship used to transport goods and people, wider and longer than the drekkar. Ships were essential for Viking life, allowing them to trade, explore, colonize new lands, and launch attacks by sea.