Question

what do you mean by resonance???

Answer 1

In physics, resonance is a phenomenon in which a vibrating system or external force drives another system to oscillate with greater amplitude at specific frequencies.

Answer 2

HEYA FOLK 

RESONANCE IS QUALITY OF SOUND BEEN DEEP 

OR IN CHEMISTRY  resonance or mesomerism is a way of describing delocalized electrons within certain molecules or polyatomic ions where the bonding cannot be expressed by one single Lewis structure.