MLB.TV Help Center
What is the difference between MLB.TV and MLB Extra Innings?
Extra Innings is a Cable TV subscription package offered by participating pay TV providers that allows you to watch out-of-market MLB games on television. Each Extra Innings package varies by pay TV provider. Some Extra Innings Packages include a subscription to MLB.TV.
MLB.TV is a streaming package that enables subscribers to view out-of-market MLB games live and on demand online on computers and supported mobile and connected devices. More details available here.