  We shortly review some applications of the (inverse) Laplace (LSR) transform
sum rules in Quantum ChromoDynamics (QCD) for extracting the fundamental QCD
parameters (coupling constant $\alpha_s$, quark and gluon condensates) and the
hadron properties (masses and decay constants). Links of LSR to some other
forms of QCD spectral sum rules are also discussed. As prototype examples, we
discuss in detail the $\rho$ and $\pi$ meson sum rules.
