  After many years of searches, the Higgs boson was observed by the ATLAS and
CMS collaborations in July 2012. Since then, its properties have been measured
using primarily the bosonic decay channels: $H \to \gamma\gamma $, $H \to Z Z$,
$H \to W^+ W^-$. In order to probe the predictions of the Standard Model and
the nature of the Higgs boson, it is also fundamental to measure its couplings
to fermions and, in particular, to quarks. In this paper we present the ATLAS
results in the search for the Higgs boson decaying to b-quark pairs using two
different production channels: associated production with a vector boson and
vector boson fusion with an additional hard photon, using 36.1
$\mathrm{fb^{-1}}$ the $pp$ collisions delivered by the LHC at a center of mass
energy of 13 $\mathrm{TeV}$.
