Responses
Doujin are a popular type of independently produced and distributed magazine, generally made in small print runs and often written by fans of manga and/or anime, including fan-fiction based on pre-existing characters from other authors.
Doujin is singular, Doujinshi plural/broader term of Doujin. DJ is shorthand.
What a r e they? Like I've heard of Doujins and Doujinshis, but I've never heard the actual definitions.(〜￣△￣)〜