Architectural Theory encompasses the ideas and principles that guide the practice of architecture. It examines the relationship between form, function, and the environment, influencing how buildings are designed and perceived. Key figures in this field, such as Le Corbusier and Louis Kahn, have shaped modern architectural thought through their writings and designs. This theory also addresses cultural, social, and technological factors that impact architecture. By exploring concepts like sustainability and urbanism, architects can create spaces that are not only aesthetically pleasing but also functional and responsive to the needs of society.