  Knowledge of lattice anharmonicity is essential to elucidate distinctive
thermal properties in crystalline solids. Yet, accurate \textit{ab initio}
investigations of lattice anharmonicity encounter difficulties owing to the
cumbersome computations. Here we introduce the phonon quasiparticle approach
and review its application to various materials. This method efficiently and
reliably addresses lattice anharmonicity by combining \textit{ab initio}
molecular dynamics and lattice dynamics calculations. Thus, in principle, it
accounts for full anharmonic effects and overcomes finite-size effects typical
of \textit{ab initio} molecular dynamics. The validity and effectiveness of the
current approach are demonstrated in the computation of thermodynamic and heat
transport properties of weakly and strongly anharmonic systems.
