The use of nuclear methods in condensed matter research makes it possible to study local properties of investigated samples. The information obtained concerns the microstructure and microdynamics of atoms and their closest surrounding. Two methods of hyperfine interaction studies: the Moessbauer spectroscopy and Perturbed Angular Correlations of g-Rays are presented. A brief description of the method is followed by a comparison of application range, sensitivities and limitations. Chosen examples illustrate the broad range of applications of the two methods.