Yahoo! has announced the addition of two new channels to its online video service.

The search engine giant is set to feature content from user-generated consumer channel Expo TV and the Sundance Channel, organisers of the international film festival of the same name.

General manager of Yahoo! social media, Jason Zajac, said: "As a leading online video destination, Yahoo! Video is constantly looking for new ways to help users discover the universe of video content on the web."

He added the move will continue to make "Yahoo! Video the most comprehensive online video resource on the web".

Under the move, the Sundance Channel will feature films, exclusive clips and behind-the-scenes footage from the festival.

Meanwhile, Expo TV will allow consumers to watch thousands of videos where users review products.

Advertisers will also get the opportunity to market their services during product demonstrations.

Earlier this week, Yahoo! announced details of a new search marketing tool which will rank advertisements on their quality as well as the price paid for keywords.