Phonon is a quasiparticle characterized by the quantization of the modes of lattice vibrations of periodic, elastic crystal structures of solids

The study of phonons is an important part of solid state physics, because phonons play a major role in many of the physical properties of solids, including a material’s thermal and electrical conductivities

A phonon is a quantum mechanical de******ion of a special type of vibrational motion, known as normal modes in classical mechanics, in which a lattice uniformly oscillates at the same frequency. These normal modes are important because any arbitrary lattice vibration can be considered as a superposition of these elementary vibrations (cf. Fourier analysis). While normal modes are wave-like phenomena in classical mechanics, they have particle-like properties in the wave–particle duality de******ion of quantum mechanics

The name phonon comes from the Greek word φωνή (phonē), which translates as voice, as the properties of long-wavelength phonons give rise to sound in solids