PARs involve controllers essentially talking pilots down to minimums.
PARs usually serve military bases.
On a PAR approach, controllers constantly issue lateral and vertical commands to keep the pilot on the proper approach path. If pilots on PAR approaches receive no communications for a period longer than five seconds, then they must execute a missed approach. First and foremost, precision approaches provide pilots with extremely accurate lateral as well as vertical guidance to relatively long and wide runways. They also give you information on your range from the runway, provide you with target altitudes along the approach path, and keep you well-aligned with the landing runway's extended centerline. It's this kind of accuracy that permits descents to altitudes as low as 200 feet agl in visibilities as low as one-half mile.