In the field of mechanical engineering resonance is considered bad for machines.
In nature and in life everything vibrates whether you feel it or not. Machines and structures have their respective natural frequencies that is measured in Hz.
As long as a machine’s natural frequency does not coincide with the natural frequency of a nearby machine or structure then all is well. However, when the machine’s natural frequency does concise with that of a nearby machine or structure then the machine will experience a problem known as resonance.
One way to fix this resonance problem is to shift the coinciding natural frequency away by say welding a strut onto the base that the vibrating machine is resting on.