  Phonon hydrodynamics is an exotic phonon transport phenomenon that challenges
the conventional understanding of diffusive phonon scattering in crystalline
solids. It features a peculiar collective motion of phonons with various
unconventional properties resembling fluid hydrodynamics, facilitating non
Fourier heat transport. Hence, it opens up several new avenues to enrich the
knowledge and implementations on phonon physics, phonon engineering, and micro
and nanoelectronic device technologies. This review aims at covering a
comprehensive development as well as the recent advancements in this field via
experiments, analytical methods, and state-of-the-art numerical techniques. The
evolution of the topic has been realized using both phenomenological and
material science perspectives. Further, the discussions related to the factors
that influence such peculiar motion, illustrate the capability of phonon
hydrodynamics to be implemented in various applications. A plethora of new
ideas can emerge from the topic considering both the physics and the material
science axes, navigating towards a promising outlook in the research areas
around phonon transport in non-metallic solids.
