Strongly correlated electron systems is a research area within condensed matter physics that investigates materials where interactions between electrons play a dominant role in determining their macroscopic properties and emergent phenomena. This field studies systems where the Coulomb interaction energy between electrons is comparable to or larger than their kinetic energy, leading to collective behaviors not adequately described by independent-electron or mean-field theories, such as high-temperature superconductivity, Mott insulation, and heavy fermion behavior. Research in this area is crucial for both fundamental insights into many-body quantum mechanics and the potential development of materials with novel electronic and magnetic properties.