Advantages:

1. Very high frequency stability.
2. Very low frequency. drift due to change in temp and other parameters.
3. It is possible to obtain very high, precise and stable frequency of oscillations.
4. The Q is very high
5. It is possible to obtain frequency higher than the fundamental frequency by operating the crystal in overtone mode.

Disadvantages:

1. These are suitable for high frequency. applications.
2. Crystal of low fundamental frequency. are not easily available.

Applications:

1. as a crystal clock in microprocessors
2. in the frequency synthesizers.
3. in radio/TV transmitters.
4. in special types of receivers.