Interior design is the art and science of enhancing the interior of a building to create a healthier and more aesthetically pleasing environment for those who use the space. An interior designer is someone who plans, researches, coordinates and directs such improvement projects. An interior designer is a multifaceted profession that includes concept development, space planning, site visits, scheduling, research, communication with project stakeholders, construction management, etc., and project execution.

Typical interior of one of the houses in the Vlkolíniec Folk Architecture Park (Slovakia) 

 In the past, interiors were designed instinctively as  part of the building process.[1] 

 The  interior design profession is a consequence of societal evolution and the complex architecture resulting from the development of industrial processes.

 The pursuit of efficient use of space, user well-being and functional design has contributed to the development of the modern interior design profession. The  interior design profession is separate and distinct from the role of interior decorator, a term commonly used in the United States. The term is less common in the UK, where the  interior design profession is not yet regulated and is therefore not, strictly speaking, an official profession. 

In ancient India, architects were also  interior designers. This can be deduced from the mention of  the architect Vishwakarma, one of the gods of Indian mythology. In these  17th-century Indian architects and house designs, carvings depicting ancient texts and events can be seen in the palaces, while in medieval times wall  paintings were a common feature of palatial dwellings in India,