For those of you who don’t remember high school English as well as you once did, here’s a recap of how the intriguing witch-goddess fits into Odysseus’ story, paraphrased from Wikipedia:
When Odysseus and his crew landed on Circe’s island, she turned half of his men into swine after feeding them cheese and wine. However, Hermes warned Odysseus about Circe and gave Odysseus a drug that allowed him to resist Circe’s magic.
Circe was attracted to Odysseus’ resistance and agreed to a bargain; she agreed to change his men back to their human form in exchange for Odysseus’ love. Thus, they all remained with her on the island for one year, feasting and drinking.
Finally, guided by Circe’s instructions, Odysseus and his crew crossed the ocean and reached a harbor at the western edge of the world.Source: scebiqu.deviantart.com