Urban Theory is a subfield within the broader discipline of Architectural Theory, which itself resides under the expansive domain of Architecture. This subfield focuses on the structural, social, economic, and environmental components that shape urban landscapes, offering a comprehensive examination of cities and the myriad factors that influence their development and functionality.

Urban Theory incorporates multi-disciplinary perspectives, drawing from sociology, geography, economics, and environmental science to holistically understand urban spaces. It investigates the morphology of cities, urban planning practices, and the dynamic interactions between urban environments and their inhabitants. This field scrutinizes both the tangible and intangible elements of urban life, exploring how buildings, streets, parks, and other physical structures contribute to the social fabric and cultural identity of urban populations.

Key concepts in Urban Theory include:
1. Urban Form and Function: Analyses the layout of urban areas, including the distribution and organization of spaces within a city, and how these support various urban functions like residential, commercial, industrial, and public activities.
2. Social Dynamics in Urban Settings: Examines how urban environments influence social interactions, community building, and the diversity of urban life. It also considers issues related to social justice, segregation, and gentrification.
3. Economic Forces and Urban Development: Studies the economic factors driving urban growth and transformation, including real estate markets, labor markets, and infrastructures such as transportation networks.
4. Environmental Impact and Urban Sustainability: Evaluates the environmental implications of urbanization, such as the urban heat island effect, pollution, and resource consumption, and proposes sustainable practices to mitigate adverse impacts.

A foundational aspect of Urban Theory is the study of urban morphology, which delves into the patterns and processes that determine the shape and structure of urban spaces. Theories such as the concentric zone model by Ernest Burgess and the sector model by Homer Hoyt are pivotal in understanding how cities expand and organize themselves.

Moreover, contemporary Urban Theory often engages with concepts of smart cities and urban resilience, addressing how modern technology and policies can foster more adaptive, efficient, and liveable urban environments. This involves integrating advanced systems for traffic management, waste disposal, energy distribution, and community services to enhance the quality of life for city dwellers.

In summary, Urban Theory is an interdisciplinary field that offers rich insights into the complexities of urban life. It provides the theoretical foundation for planning, designing, and managing sustainable and inclusive urban environments, thereby shaping the cities of the future.