In physics, resonance is the tendency of a system to oscillate at maximum amplitude at certain frequencies, known as
the system's resonance frequencies (or resonant frequencies). At these frequencies, even small periodic driving forces
can produce large amplitude vibrations, because the system stores vibrational energy. When damping is small, the
resonance frequency is approximately equal to the natural frequency of the system, which is the frequency of free
vibrations. Resonant phenomena occur with all types of vibrations or waves: there is mechanical resonance, acoustic
resonance, electromagnetic resonance, and resonance of quantum wave functions. Resonant systems can be used to
generate vibrations of a specific frequency, or pick out specific frequencies from a complex vibration containing many
frequencies.

Resonance was discovered by Galileo Galilei with his investigations of pendulums beginning in 1602.

Source: WikipediA
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