Is Mapo in Hongdae?

Excuse me, I'm a bit confused about the location of Mapo. I've heard it mentioned in relation to Hongdae, but I'm not sure if they're in the same area. Could you please clarify for me? Is Mapo actually located within the Hongdae district, or is it a separate place entirely? I'd appreciate any information you can provide to help me understand the geography better.