Roku is a Media Streaming Box by which users can easily stream and watch movie, music, TV series on their TV screens. It can be connected to the Internet by both WiFi or Ethernet cable. Since Roku streams the videos in full HD quality, it demands a strong Internet connection. It worth mentioning that the latest version, Roku4 has the ability to supports 4K quality streams. Accordingly, for those customers who have 4K TVs, the Roku would be best choice.