Noah’s Ark was mainly designed to preserve life during the Flood. Genesis describes God instructing Noah to bring his family and representatives of living creatures into the vessel so they would survive the waters.
The narrative’s preservation purpose appears in the construction instructions and in the command to bring animals into the Ark. Genesis also says the Ark carried food for Noah, his family, and the animals, showing that survival required supplies as well as shelter.
The Ark is therefore not presented as a warship, a royal transport, or a container for valuables. Its function is protective and biological within the story: to keep Noah’s household and animal life alive through the catastrophe.
The wording about animals varies in detail across translations and interpretations, including references to pairs and to additional animals described as clean. Those distinctions should not obscure the central purpose stated by Genesis: preservation of life through the Flood.