By tuning to low frequency (LF) radio stations such as NDBs, a pilot may use ADF for navigation in cross-country flying.
The ADF has automatic direction seeking qualities which result in the bearing indicator always pointing to the station to which it is tuned.
The easiest, and perhaps the most common method of using ADF, is to “home” to the station. Since the ADF pointer always points to the station, the pilot can simply head the airplane so that the pointer is on the 0° or nose position. The station, then will be directly ahead of the airplane.
References: CFI Notebook