This is internet...and you can read? I would try google or any other engine. Sometimes also a book can help. This is a collection of paper bound together.
Dear colleague! This is really a question for which you can find a comprehensive answer in a dictionary of physics ... if you do not like Google. Nevertheless, a crystal is a special type of solid state where the atoms have a periodic structure. Such a crystal can be used as laser resonator where light waves are oscillating. More generally, the resonator is the medium / volume / space where species like waves .... photons, plasmons, phonons etc. are excited to move periodically at a special frequence (in resonance). Wkr, M. Herms.
A crystal is a three dimensional solid in which atoms are arranged in regular periodic manner in all three dimensions.
A resonator is a device which exhibits resonance or resonant behavior.
An oscillator is a electronic device which produces periodic oscillating electronic signal.
Dear Ekta,
May you start with an oscillator which is a device converting a DC electric power into an alternating periodic waveform such as sinusoidal wave. Any oscillator has specific performance parameters: the oscillation frequency, the output voltage, the output impedance and the frequency stability which is a measure how the frequency stable with time.
To build such oscillators one need an amplifier with positive feed back and a timing network which specify the periodic time of the oscillator. There are three types of timing networks: the resistor-capacitor circuits, the inductor- capacitor circuits and the crystal resonators. The least satble one the the r-c oscillator and the highest sable one is the crystal oscillator. Resonators are elements or circuits showing resonance at a specific frequency. The L-C shows resonance at a frequency f0=1/2 pi sqrt (LC), therefore it can be termed resonator. A crystal cut with a specific dimensions acts also as a resonator as has specific resonance frequencies. However crystals can have overtones.
This topic is handled in more details in the link:https://www.researchgate.net/post/What_are_the_factors_affecting_the_stability_of_an_oscillator
Best wishes
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