The applied arts are the application of design and decoration to everyday objects to make them aesthetically pleasing. The term is applied in distinction to the fine arts which aims to produce objects which are beautiful or provide intellectual stimulation. In practice, the two often overlap.
Architecture is both the process and the product of planning, designing, and constructing buildings or any other structures. Architectural works, in the material form of buildings, are often perceived as cultural symbols and as works of art. Historical civilizations are often identified with their surviving architectural achievements.
A building, or edifice, is a structure with a roof and walls standing more or less permanently in one place, such as a house or factory. Buildings come in a variety of sizes, shapes, and functions, and have been adapted throughout history for a wide number of factors, from building materials available, to weather conditions, land prices, ground conditions, specific uses, and aesthetic reasons. To better understand the term building compare the list of nonbuilding structures.
The true architectural art, that art toward which I would lead you, rests, not upon scholarship but upon human powers; and, therefore, it is to be tested, not by the fruits of scholarship, but by the touch-stone of humanity.
Louis Sullivan, Kindergarten Chats (1918) Ch. 10 : A Roman Temple