The meaning of the word function Changes subtly depending on the area or field in which it is used. Generally&sbquo we can regard it as workings interpreted as a system&sbquo that is&sbquo an action that contributes towards realizing an established purpose. This point of view says that the elements that compose a system and the action of each part influence the system as a whole&sbquo that is&sbquo they interact with one another and make a rational contribution to the goal. This refers to the degree of realization of the role that we perceive as a mathematical function. Function&sbquo functionality&sbquo functionalism&sbquo and functional aesthetics have always been topics or issues of theories concerning the essence of design. From the definition of function&sbquo the more one tries to find the role of design&sbquo the function of design&sbquo the more that function&sbquo functionality&sbquo functionalism and functional aesthetics become key words in a theory of relationships with powerful interactions. When proposing and explaining keywords and concepts&sbquo form and function&sbquo environment and function&sbquo and function as a relationship are all linked to conscious linguistic thought. When human beings think about and plan a function they have considered something functional if it copies the workings of nature or roles that are realized by natural forms. This can be considered a genealogy of functionalism that's most reflected in Darwinism&sbquo Engineering&sbquo which uses natural functions intensively&sbquo discovers functional elements that are elements of physical systems and attempts to realize them. Defining the result of this itself as a function is occurring with the establishment and evaluation of function in various fields. On the opposite extreme&sbquo the concept of God or gods who preside over the daily functions of human beings establishes a functioning God or gods. In the rituals or celebrations of divinity&sbquo the psychological activity of revering and placing importance on function can be considered the motive for thinking about symbolism and functionality. Ultimately&sbquo when it comes to the relationship between design and function&sbquo creating a definition of function as a foundation for various fields and areas and historical genealogy makes it possible to express and convey the significance of function at the heart of design.