  Examples are presented of applications of the Lema\^{i}tre - Tolman model to
problems of astrophysics and gravitation theory. They are: 1. Inferring the
spatial distribution of matter by interpretation of observations; 2.
Interaction of inhomogeneities in matter distribution with the CMB radiation;
3. Evolution of voids; 4. Singularities; 5. Influence of electromagnetic field
on gravitational collapse. This review is meant to demonstrate that the theory
is already well-prepared to meet the challenges posed by an inhomogeneous
Universe.
