Retro design style, also known as Deco, is a style of design that was popular in the 1920s and 1930s. It is characterized by its use of bold geometric shapes, bright colors, and lavish ornamentation. This style was heavily influenced by the Art Deco movement, which was a reaction to the more traditional styles of the time. Retro design style has seen a resurgence in popularity in recent years, with many modern designers incorporating elements of this style into their work.