Answer : Interior design is an umbrella term for a variety of occupations that work on designing the interior environment of a space. This includes modern residential design, furniture, textiles and products, commercial storefront design and showroom displays, office layouts and furnishings (partitions) to building exteriors. Successful interior designers are meticulous observers with keen aesthetic sensibilities to create comfortable spaces within budget constraints. They need sufficient knowledge of engineering to pinpoint movement patterns in buildings or specific needs for activities.
They generally show great comprehension in architecture history, art history - especially architectural exhibitions - and may have studied psychology too in order to understand human behaviour better when designing rooms or offices etc.