Is window curtains useful in house's design ?

It is really very important question arise on front of us that windows curtain really important as well as like other curtain. When any one buy or build new house he want that his house looking very beautiful and culture . So they try to design house own requirements. They buy many type of modern curtain like window curtain, Blackout roller blinds, Blackout vertical blinds, shutter blinds etc. They are all is useful for house. Any new generation house have different type of parts like window, door, rooms etc. So in modern term to say that every place have different position to design. So accordingly to shape of parts, everyone want to design that. Like window it is most important part of our house. Because that everyone want to that they take natural air and natural air come in house without any disturbance. So in window we should use more ease open or close curtain which ease to open and close any time. So I think that window curtain is really important to our house and our family health.