A computer monitor can be used as a TV, by connecting it to a television tuner and an aerial.
A computer monitor usually has a large screen and one or more speakers built-in. The most difficult connection is the audio cable. Monitor audio connectors only carry audio signals, not video signals so you will need an adapter called a “break-out box” for this if your system does not already have one built-in. If all goes well, you should be able to switch between TV and PC inputs with the press of a button on your remote control!