Resonant circuits in a receiver are used to:

Resonant circuits, often called tuned circuits, are designed to respond strongly to one specific frequency while ignoring others. They achieve this by utilizing the unique impedance characteristics of inductors and capacitors at resonance. In a radio receiver, an antenna picks up thousands of different radio frequency signals simultaneously. By using a resonant circuit, the receiver can be adjusted to isolate and select only the desired station's signal from the crowded radio spectrum. Distractors like filtering direct current or amplifying audio describe the functions of power supply capacitors and active components like transistors, respectively, not radio frequency resonant circuits.