Making the move to digital TV can give viewers access to additional local TV channels. Multicasting is the technology that allows a single station to provide as many as six separate programming streams simultaneously, free and over the air.
It is not possible to convert an analog television to a digital television. However, by using a digital set top receiver, it is possible to receive digital signals and deliver them as an analog...
Check the user's manual. Most TVs made in the last 2 years are digital. For sets older than that, you can find out by going to the manufacturer's web site.