Hi,
Thanks for the inquiry.
Roku streaming devices can be used with an existing cable service or instead of it. For more detailed information about what a Roku streaming player is, visit our Support page here: What is a Roku® streaming player?
If you have any further questions regarding Roku streaming devices and services, feel free to continue to post here in the Community as we would all be more than happy to help!
Happy streaming!
Thanks,
Danny
Danny R.
Roku Forum Moderator