Curtain Pattern

A curtain is a piece of cloth or other material intended to block or obscure light, air drafts, or, water. A curtain is also the movable screen or drape in a theatre that separates the stage from the auditorium or that serves as a backdrop/background.
Curtain, in interior design, decorative fabric commonly hung to regulate the admission of light at windows and to prevent drafts from door or window openings. Curtains, usually of a heavy material, arranged to fall straight in ornamental folds are also called draperies. Portieres are heavy curtains hung in a doorway.
Curtains are often hung on the inside of a building's windows to block the passage of light. For instance, at night to aid sleeping, or to stop light from escaping outside the building (stopping people outside from being able to see inside, often for privacy reasons).
Curtains help control the amount of natural light you have in your space. Some days you'd want your home to be filled with an abundance of sunlight while other days you want to be in a darker room to take naps or watch TV without the glare of sunlight so curtains are your solution.
Everyone buys window curtains, but that's not helpful on it's own, so let's dig into some problems they solve. The three big reasons people buy them are: one, to control light; two, control temperature in living spaces; and three, keep prying eyes out (i.e. privacy).