Why can't vampires come out in the sun?

Vampires are often depicted as being harmed or weakened by sunlight due to their supernatural nature. In folklore and popular culture, sunlight is associated with purity and life, which contrasts with the undead status of vampires. Exposure to sunlight is said to cause them severe burns, disintegration, or death, reinforcing their need to operate in the shadows and darkness. This characteristic enhances their mysterious and frightening persona in stories.