In the Genesis account of Noah’s Ark, a rainbow represents God’s covenant after the Flood.
Genesis 9 describes God’s covenant with Noah, his descendants, and every living creature. The rainbow is placed in the clouds as a sign that the waters will not again become a flood destroying all life on earth.
The passage presents the rainbow as a visible reminder of the covenant rather than merely as a weather phenomenon. It links a natural feature of the sky with a theological promise made after Noah leaves the Ark.
The covenant is broader than Noah’s immediate family: Genesis explicitly includes future generations and animals. This is why the rainbow is associated in the passage with all living creatures, not only with the human survivors.