Tags

A tag is a keyword or term associated with or assigned to a piece of data e.g articles, pictures in this case video clips.

When you enter a search name for video, you often type the subject name or terms associated with that specific subject, or the category you intend the clip to fall into, or a combination of all three.

For example I may type " Jitsu" as the subject area then type " punch" as the a name associated within Jitsu.
The video search engine will then search the tags of hundreds of videos of these specified key-words. This fast procedure is used across web 1.0 and web2.0 websites.
This video is one of the videos obtained from the search of "Jitsu" and "punch"