Interior Design is not the same as decoration. Learn the difference.
"Decoration is the furnishing or adorning a space with fashionable or beautiful things. Interior design is a multifaceted profession in which creative and technical solutions are applied within a structure to achieve a built interior environment. Interior designers should plan, design and furnish interiors of residential, commercial or industrial buildings. They formulate design which is practical, aesthetic and conductive to intend purposes, such as raising productivity, selling merchandise or improving lifestyle." excerpt taken from different interior design related sources.