How many devices can stream simultaneously with one YouTube TV subscription?

A YouTube TV subscription allows for three separate devices to stream content simultaneously on the same account. This means that users can share their login credentials with family members or friends and everyone can watch live TV or recorded shows on their own devices without interfering with each other's viewing experience, as long as the number of concurrent streams does not exceed three. It is also pertinent to note that this feature is designed to accommodate households with multiple viewers and should be used in compliance with YouTube TV's terms of service.