  We propose a novel equation of state (EoS) which explains the evolutionary
history of a flat Friedmann-Lemaitre-Robertson-Walker (FLRW) Universe. The
uniqueness of this EoS lies in the fact that it incorporates the Lambert $W$
function in a special fashion. It is explicitly demonstrated that with
observationally relevant values of the unknown parameters
$\vartheta_\mathrm{1}$ and $\vartheta_\mathrm{2}$, all the evolutionary phases
of the Universe can be reproduced. Moreover, it also shows that the initial
singularity is unavoidable and asserts that the late-time acceleration of the
Universe would continue forever.
