CMIP5 stands for Coupled Model Intercomparison Project Phase 5. It is an international collaborative effort that involved various climate modeling centers around the world to simulate and compare global climate models under standardized conditions. CMIP5 aimed to improve climate models and provide a basis for understanding and predicting climate change, including factors such as greenhouse gas concentrations, aerosols, and land use changes. The CMIP5 project produced a wealth of climate model output data that has been used by scientists to assess the impacts of climate change, evaluate the accuracy of different models, and improve our understanding of the Earth's climate system. The data from CMIP5 has been widely used in climate research, policy making, and for informing public understanding of climate change.