  The KLOE detector at the DA$\Phi$NE $\phi$-factory has been operating in two
periods from 2001 to 2006 and from 2014 to 2018 collecting a large sample of
$\phi$-meson decays. This allowed to perform precision measurements and studies
of fundamental symmetries, and searches of New Physics phenomena. In this
overview, the results of KLOE and KLOE-2 Collaborations are presented. The most
recent results from the KLOE experiment are discussed, covering: the
measurement of the running fine-structure constant $\alpha_{em}$, the Dalitz
plot measurement of $\eta \rightarrow \pi^+\pi^-\pi^0$, the search of a U
boson, tests of discrete symmetries and quantum decoherence.
