The last two decades have seen a revolution in the field of asteroseismology – the study of stellar pulsations. It has become a powerful method to precisely characterize exoplanet host stars and as a consequence also the exoplanets themselves. This synergy between asteroseismology and exoplanet science has flourished in large part due to space missions such as Kepler and TESS, which have provided high-quality data that can be used for both types of studies. Perhaps, the primary contribution from asteroseismology to the research on transiting exoplanets is the determination of very precise stellar radii that translate into precise planetary radii, but asteroseismology has also proven useful in constraining eccentricities of exoplanets as well as the dynamical architecture of planetary systems. This chapter introduces some basic principles of asteroseismology and reviews current synergies between the two fields.