Revolving doors are a type of entrance commonly found in buildings like hotels, offices, and shopping centers. They consist of several panels that rotate around a central axis, allowing people to enter and exit without creating a draft. This design helps maintain indoor temperature and reduces energy costs by minimizing the exchange of air between the inside and outside. These doors are often made of glass and metal, providing visibility and durability. They can accommodate a steady flow of foot traffic while preventing the entry of wind and noise. Revolving doors are also designed to be safe, with features that prevent them from closing on people or objects.