Noah's Ark is a massive boat that Noah built according to God's command in Genesis to save his family and animals.
In Genesis, when God was angry with this world, He judged the earth with a great flood, and it was a large boat in which only Noah and his family were saved.
Gen 6:14Make thee an ark of gopher wood; rooms shalt thou make in the ark; and shalt pitch it within and without with pitch.
The ark was a total of 3 stories high.
Gen 6:15And this is the fashion which thou shalt make it of: The length of the ark shall be three hundred cubits, the breadth of it fifty cubits, and the height of it thirty cubits.Gen 6:16A window shalt thou make to the ark, and in a cubit shalt thou finish it above; and the door of the ark shalt thou set in the side thereof; with lower, second, and third stories shalt thou make it.
The ark is also a symbol of baptism and a symbol of salvation.