One of the largest provider of Interest access service in the United States. If you are surfing the net, you could be using their services right now. Comcast provides high speed Internet access, cable and telephone services, although they deal primarily with residental customers. They have different packages for different level of users. Other than providing services, they also develop content for cable - like the Comcast Network Channel. This Channel offers news, sports, and entertainment for their viewers. Comcast has over 16 million Internet subscribers as of date. However Comcast is also famous for trying to limit their subscribers bandwidth and usage, which had lead to a lot of unhappy customers. They claim that it will affect their other users. It seems then that Comcast is admiting that they are overselling their bandwidth, which should not be affected if they don't actually oversell.