YouTube videos are already tagged when uploaded, which helps the site to serve up similar vids when people are watching. However, the site is debuting a new feature today called 'Topics', which looks to make this process more efficient. It sounds similar to tags, but the keywords are based on YouTube's own analysis of what a video is about or relates to. For example, Lady Gaga's Bad Romance video might be associated with a topic called 'Workout Song', and when that link is clicked, users will find other videos sharing this attribute.
YouTube launches ‘Topics’ to help users find relevant videos
November 10th, 2010 by Music Ally