Tag recommendation systems recommend relevant tags for an untagged user resource. Recommending tags can serve various purposes, such as:

Tag recommendation systems recommend relevant tags for an untagged user resource. Recommending tags can serve various purposes, such as: increasing the chances

of getting a resource annotated and reminding a user what a resource is about. Furthermore, lazy annotating users would not need to come up with a tag themselves but just select the ones readily available in the recommendation list according to what they think is more suitable for the given resource. Design an appropriate personalized tag recommendation algorithm for video sharing websites such as YouTube