Interior design is considered as a concept that accompanied the theory and practice of architecture. It is represented as a form of manifestation of Architecture ,which influenced and affected by the intellectual trends and theory of architecture in their quest for the formation of modern architecture since the beginning of the twentieth century.
This paper discusses the historical concept development of interior design in the period, in which modernism and postmodernism was formed. The aim of this paper to detect the most prominent aspects that define the concept of interior design, and down to determine the particularity of each movement with respect to the interior design vision. These aspects were: the nature of the interior design and essence, the goal of the design procedure,the relationship of interior design with interpretation, its sources, and its design determinants.
Keywords: interior design, interior, interior space.