  The exploration of nontrivial transport phenomena associated with the
interplay between magnetic order and spin-orbit coupling (SOC), particularly in
van der Waals (vdW) systems has gained a resurgence of interest due to their
easy exfoliation, ideal for two-dimensional (2D) spintronics. We report the
near room temperature quasi-2D ferromagnet, Fe$_4$GeTe$_2$ from the iron-based
vdW family (Fe$_n$GeTe$_2$, $n$=3,4,5), exhibiting a large anomalous Hall
conductivity (AHC), $\sigma^A_{xy}$ $\sim$ 490 $\Omega^{-1}\textrm{cm}^{-1}$ at
2 K. The near quadratic behavior of anomalous Hall resistivity
($\rho^{A}_{xy}$) with the longitudinal resistivity ($\rho_{xx}$) suggests that
a dominant AHC contribution is coming from an intrinsic Berry curvature (BC)
mechanism. Concomitantly, the electronic structure calculations reveal a large
BC arising from SOC induced gaped nodal lines around the Fermi level, governing
such large AHC property. Moreover, we also report an exceptionally large
anomalous Hall angle ($\simeq$ 10.6\%) and Hall factor ($\simeq$ 0.22 V$^{-1}$)
values which so far, are the largest in compared to those for other members in
this vdW family.
