Niconico Douga is a popular Japanese video-sharing platform launched in 2006. It allows users to upload, share, and view videos, similar to YouTube. One unique feature is the ability for viewers to comment on videos in real-time, with comments appearing directly on the video screen. The platform hosts a wide variety of content, including music, anime, and gaming videos. It has a strong community aspect, where users can create channels and interact with each other. Niconico Douga also features live streaming and has become a hub for otaku culture in Japan.