The International Style is a major architectural style and movement that began in western Europe in the 1920s and dominated modern architecture until the 1970s. It is defined by strict adherence to functional and utilitarian designs and construction methods, typically expressed through minimalism. The style is characterized by modular and rectilinear forms, flat surfaces devoid of ornamentation and decoration, open and airy interiors that blend with the exterior, and the use of glass, steel, and concrete.