https://www.boldmethod.com/learn-to-fly/navigation/how-to-fly-par-instrument-approaches/

ATC monitors your aircraft position and issues specific heading and altitude information over the radio throughout the entire approach.

https://www.boldmethod.com/learn-to-fly/navigation/surveillance-approach-asr/

An ASR is a non-precision approach where Air Traffic Control provides lateral guidance to you using radar to monitor your position. ATC gives you a series of headings and corrections to align your final approach with the runway’s extended centerline.