Since Comcast merged with NBCUniversal in 2011, the Xfinity brand has become synonymous with cable TV. But what many Comcast customers may not know is that they can now watch their Xfinity channels on their computer.

All you need is a high-speed internet connection and a Xfinity username and password. Once you have those, you can go to Comcast’s website and sign in. From there, you can choose which channels you want to watch and create a personalized guide.

You can also watch Xfinity on your smartphone or tablet. Just download the Xfinity Stream app and sign in with your …