Youku. Youku contains a large number of genuine videos, and original 3d videos of You Dou and Yi Shan can be watched on Youku. Youku is the core user engine of Alibaba Culture and Entertainment Group and the leading online video platform in China. Now it supports three terminals: PC, TV and mobile, and has a variety of content forms such as copyright, co-production, self-made, user-generated content, professional-generated content and live broadcast.