  Precision studies at electron-positron colliders with center-of-mass energies
in the charm-tau region and below have strongly contributed to our
understanding of light-meson interactions at low energies. We focus on the
processes involving two or three light mesons with invariant masses below
nucleon-antinucleon threshold. A prominent role is given to the interactions of
the nine lightest pseudoscalar mesons (pions, kaons, $\eta$, and $\eta'$) and
the two narrow neutral isoscalar vector mesons $\omega$ and $\phi$.
Experimental methods used to produce the mesons are reviewed as well as theory
tools to extract properties of the meson-meson interactions. Examples of recent
results from the DA$\Phi$NE, BEPCII, and VEPP-2000 colliders are presented. In
the outlook we briefly discuss prospects for further studies at future
super-charm-tau factories.
