Comcast's Xfinity cable service does offer high definition, or HD, television. The company provides thousands of television shows and movies in HD, both through its standard cable services and online.
High definition television has a sharper, clearer picture, with a better sound quality. HD programming has 5.1 Dolby Surround Sound where it is available. Another advantage of high definition television is the wide screen formatting. Televisions that are not HD come in a more square format, which cuts a lot of the picture off and doesn't allow the customer to see the full image. This can cause a lot of things to be missed in movies and television shows.