What’s the difference between Comcast and Xfinity?

Comcast and Xfinity are the same company.   Comcast started out providing residential cable services. As Comcast continues to grow and buy more properties (companies, TV channels, etc.) they needed a way to separate the residential services from the other companies they own, hence the Xfinity branding.  Xfinity is Comcast’s residential services division.  They are one in the same.

Comcast offers service to U.S. residential and commercial customers in 40 states including the District of Columbia.  Comcast is the largest broadcasting and largest cable company in the world by revenue and is the second largest pay-TV company after the AT&T-DirecTV acquisition, the largest cable TV company and largest home Internet service provider in the United States, and the nation's third largest home telephone service provider.

As the owner of the international media company NBCUniversal since 2011. Comcast is also a producer of feature films and television programs intended for theatrical exhibition and over-the-air and cable television broadcast.

Comcast operates multiple cable-only channels (including E! Entertainment Television, the Golf Channel, and NBCSN), over-the-air national broadcast network channels (NBC and Telemundo), the film production studio Universal Pictures, and Universal Parks & Resorts, with a global total of nearly 200 family entertainment locations and attractions in the U.S. and several other countries.

Fully or partially owned Comcast programming includes Comcast Newsmakers, Comcast Network, Comcast SportsNet, SportsNet New York, MLB Network, Comcast Sports Southeast/Charter Sports Southeast, NBC Sports Network, The Golf Channel, AZN Television, and FEARnet.

Comcast's content networks and investments also include E!, Esquire Network, Golf Channel, NBCSN, Sprout, TV One, and the regional Comcast SportsNets.

Comcast became majority owner of Comcast SportsNet, as well as Golf Channel and NBCSN (formerly the Outdoor Life Network, then Versus).

This isn’t an exhaustive list of all of the properties owned by Comcast, but as you can see they own quote a few properties and that is why it was necessary to rebrand their name to market a better fit their residential services.