  Information is presented on the state of research on the effect of hydrogen
on the superconducting properties of various compounds. The review consists of
an introduction, one appendix and four sections: methods for the synthesis of
modern hydrogen-containing superconductors, experimental studies of the
properties of hydrogen-containing superconductors, on the mechanisms of the
influence of hydrogen on superconductivity, problems and prospects of
hydrogen-containing superconductors.
