Answer:
What is a glyph? The Myan language which has a total of 800 hieroglyphic symbols.
What is a codex? The paper (bark) that was used to write glyphs in.
Why might a codex that saves information and events help a citizen thrive? If something were to happen, and someone found this, they may have a direction of what to do and where to go. (I think)
What is the Popol Vuh? The most famous codex explaining a story of creation.
Why might the Mayans have come up with this story? I am not 100% sure about this, but... The story of creation was about how the members of the royal K'iche' lineages once ruled the highlands of Guatemala. This story may have been created to signify the history of Guatemala, or because these people were dominant and wanted everyone to know where they originated from. It could also be because they wanted their beliefs of earth's creation to flourish, and have the belief spread across the world.
