  We review the semiclassical two-step model for strong-field ionization. The
semiclassical two-step model describes quantum interference and accounts for
the ionic potential beyond the semiclassical perturbation theory. We discuss
formulation and implementation of this model, its further developments, as well
as some of the applications. The reviewed applications of the model include
strong-field holography with photoelectrons, multielectron polarization effects
in ionization by an intense laser pulse, and strong-field ionization of the
hydrogen molecule.
