Mid-century modern (MCM) is an American design movement in interior, product, graphic design, architecture, and urban development that was popular from roughly 1945 to 1969, during the United States's post–World War II period. The term was used descriptively as early as the mid-1950s and was defined as a design movement by Cara Greenberg in her 1984 book Mid-Century Modern: Furniture of the 1950s. It is now recognized by scholars and museums worldwide as a significant design movement. The MCM design aesthetic is modern in style and construction, aligned with the Modernism movement of the period. It is typically characterized by clean, simple lines and honest use of materials, and it generally does not include decorative embellishments.