A building or building is a structure, such as a house or factory, whose roof or wall is more or less permanently fixed to a place. Buildings have various sizes, shapes and functions, and have been modified in the whole historical process due to various factors, starting from the available building materials, weather conditions, land prices, ground conditions, specific uses and aesthetic reasons. To better understand the word building, compare the list of non building structures.

Buildings meet a wide range of social needs - mainly to avoid the weather, safety, living space, privacy, storage and comfortable living and working. As a shelter, buildings represent the physical division of human habitats (comfortable and safe places) and external (sometimes bad and harmful places).

Since the first cave painting, buildings have become objects or canvases with a lot of artistic expression. In recent years, interest in sustainable planning and architectural practice has become an intentional part of many new architectural design processes.