Doujinshi are self-published works, often in the form of manga, novels, or art books, created by fans or independent artists. These works can feature original stories or be based on existing characters and universes from popular media, such as anime, video games, or manga. Doujinshi are typically produced in small quantities and sold at conventions or online, allowing creators to share their passion with others. The term "doujin" refers to a group of people with a common interest, while "shi" means publication. This form of creative expression is popular in Japan and has gained international recognition, fostering a vibrant community of artists and fans who appreciate unique interpretations of their favorite works.