Building performance refers to the analysis and evaluation of how a building or structure functions in terms of energy efficiency, indoor air quality, comfort, and other factors that can affect its occupants' well-being and productivity. This research area focuses on understanding how different design features, materials, and systems impact a building's overall performance and how to optimize these elements to create more sustainable, comfortable, and healthy indoor environments. Researchers in this field often use data collection, simulations, and monitoring tools to assess and improve the performance of buildings in various climate conditions and settings. The ultimate goal of building performance research is to design and construct buildings that are more energy-efficient, cost-effective, and environmentally friendly.