So if you can receive it at all, you receive it perfectly. A digital picture isn't subject to ghosting, hazing, and interference of the kind you get through nondigital equipment and service. But to get there, the signal must first be compressed. A digital signal can be compressed much easier than an analog one and can take up far less bandwidth. The compression scheme for digital television is called MPEG-2, the same one used to create DVDs.
All compression is a compromise.
But you won't care, because MPEG-2, though not perfect, is marvelously good at knowing what to compress. It takes advantage of how the eye perceives color variations and motion. Inside each frame, an MPEG-2 encoder records just enough detail to make it appear as if nothing is missing from the picture. The encoder also compares adjacent frames and only records the sections of the picture that have moved or changed. The miracle of compression allows for more than just a superior picture to be broadcast.