Athena was the Goddess of Wisdom. She was also good at weaving. One day Arachne said she is a better weaver than Athena. Athena became angry and challenged Arachne to a weaving contest. While they were weaving, Arachne wove a picture that insulted the gods. Athena became more angry at Arachne. Arachne was sad about what she did. She wanted to kill herself. Athena didn't want that to happen so she turned Arachne into a spider. That would explain why spiders weave webs.