C93, or C93, refers to the 93rd Comic Market, a large event held in Tokyo, Japan, where artists and creators gather to sell their self-published works, including manga, anime, and doujinshi. This event is a significant part of Japanese pop culture, attracting thousands of fans and creators from around the world. The event typically spans three days and features a wide variety of merchandise, panels, and activities. It serves as a platform for independent creators to showcase their work and connect with fans, contributing to the vibrant otaku culture in Japan.