The term "Hellmouth" refers to a mythical entrance to the underworld or a place associated with evil and darkness. It is often depicted in literature and folklore as a gaping maw or cavern that leads to hell or a realm of torment. The concept is prevalent in various cultures and is frequently used in religious texts and stories to symbolize the struggle between good and evil. In popular culture, the term gained prominence through the television series Buffy the Vampire Slayer, where the town of Sunnydale is built on a Hellmouth, attracting supernatural creatures and dark forces. This setting serves as a backdrop for the show's exploration of themes like friendship, sacrifice, and the battle against evil.