YouTube TV is a subscription-based streaming service that offers live TV channels, on-demand content, and cloud DVR storage. It provides access to major broadcast networks like ABC, CBS, NBC, and Fox, along with popular cable channels such as ESPN, CNN, and FX. Subscribers can stream on various devices, including TVs, smartphones, tablets, and computers, and enjoy features like personalized recommendations, unlimited DVR space to record shows, and the ability to watch on multiple devices simultaneously. YouTube TV aims to provide a cable-like experience without the traditional cable box and long-term contracts.