Two-dimensional is a term that originated from Japanese culture and is often used to describe the characters, scenes, and concepts in fictional worlds or anime, manga, games, and other media. This term first appeared in Japanese anime and game culture, and then gradually expanded to other media fields. The word two-dimensional originated from the three-dimensional world, which was the real world. In Japan, people often confuse the characters in the fictional world with the people in the real world, so these fictional worlds are called two-dimensional worlds. In the 2D world, people could experience a wonderful world that was different from the real world. The 2D world referred to a special group in these worlds, namely 2D enthusiasts. Two-dimensional culture was a special cultural phenomenon that included anime, manga, games, novels, and other media. It was very popular in Japan and gradually expanded to other countries. Although the word '2D' has different meanings in different fields, it is usually used to describe things related to anime, comics, games, and other media.