Question

what is decible? is it unit of sound?

Answer 1

The decibel ( dB) is used to measure sound level, but it is also widely used in electronics, signals and communication. The dB is a logarithmic way of dscribing a ratio. The ratio may be power, sound pressure, voltage or intensity or several other things.

Answer 2

Decibel is a unit used to express the intensity of a sound waves.

Yes, it is Unit of sound.