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The  resonance is the tendency of a system to oscillate at maximum amplitude at certain frequencies. Frequencies at which the response amplitude is a relative maximum are known as the system's resonant frequencies.

                           Electrical resonance occurs in an electric circuit at a particular resonant frequency when the impedance between the input and output of the circuit is at a minimum.

Resonance of a circuit involving capacitors and inductor occurs because the collapsing magnetic field of the inductor generates an electric current in its windings that charges the capacitor, and then the discharging capacitor provides an electric current that builds the magnetic field in the inductor, and the process is repeated.Similar to mechanical pendulum.

Resonance is used for tuning and filtering, because it occurs at a particular frequency for given values of inductance and capacitance