YouTube will begin organising millions of its videos into automatic categories called "topics" on its ideas incubator TestTube this week, the video-sharing site announced on Thursday.
The new topics are constructed from a complex analysis of comments, embedding, and other viewing patterns.
The site hopes that the categorisation will help users use video search more effectively.
"People don't know what to search for because they don't know what's there," said Palash Nandy, an engineer at YouTube.
YouTube users come to the site to discover videos, not just search for things they already know. "This is where topics will come in handy," Nandy said, adding that if a user searches for "stupid videos, the video sharing site will already have a directory of videos that fit this category.
The company also unveiled YouTube Remote, an Android app that allows users to control YouTube on a Google TV system, watch a video on a smartphone and transfer it onto Google TV.