The review by Maxim Mostovoy explores the phenomenon of magnetoelectric coupling in multiferroic materials, which simultaneously exhibit ferroelectricity and magnetism. This coupling arises from the spontaneous symmetry breaking at phase transitions, leading to interesting phenomena such as high sensitivity of electric polarization to magnetic fields. The review discusses two main types of multiferroics: type-I multiferroics, where ferroelectricity precedes magnetic ordering, and type-II multiferroics, where electric polarization is induced by ordered spins. Key mechanisms for magnetoelectric coupling include virtual charge fluctuations in Mott insulators, exchange interactions between spins, and the inverse Dzyaloshinskii-Moriya (DM) interaction. The review also highlights recent advancements in understanding the microscopic origins of this coupling, the discovery of new materials, and the potential for practical applications in energy-efficient magnetic devices. Additionally, it covers the role of magnetic frustration, domain walls, and the dynamics of skyrmions in multiferroic materials, emphasizing the potential for robust electric control of magnetism at room temperature.The review by Maxim Mostovoy explores the phenomenon of magnetoelectric coupling in multiferroic materials, which simultaneously exhibit ferroelectricity and magnetism. This coupling arises from the spontaneous symmetry breaking at phase transitions, leading to interesting phenomena such as high sensitivity of electric polarization to magnetic fields. The review discusses two main types of multiferroics: type-I multiferroics, where ferroelectricity precedes magnetic ordering, and type-II multiferroics, where electric polarization is induced by ordered spins. Key mechanisms for magnetoelectric coupling include virtual charge fluctuations in Mott insulators, exchange interactions between spins, and the inverse Dzyaloshinskii-Moriya (DM) interaction. The review also highlights recent advancements in understanding the microscopic origins of this coupling, the discovery of new materials, and the potential for practical applications in energy-efficient magnetic devices. Additionally, it covers the role of magnetic frustration, domain walls, and the dynamics of skyrmions in multiferroic materials, emphasizing the potential for robust electric control of magnetism at room temperature.