An intelligent building uses technology and automation to optimize its structure, systems, services, and management to create a safe, healthy, and comfortable environment for occupants. It aims to be environmentally friendly and cost effective by adjusting features like lighting, ventilation, security and more in response to changes. Intelligent buildings offer advantages like improved air quality, higher security, reduced costs, and environmental benefits but also have drawbacks such as high initial costs and needing trained technicians for maintenance and repairs.