The Community Land Model (CLM) is a widely-used modeling framework that simulates land surface processes at regional to global scales. It is a component of the Community Earth System Model (CESM) and is designed to represent the interactions between the atmosphere, vegetation, soil, and hydrology. The CLM includes modules for simulating variables such as soil moisture, vegetation dynamics, energy balance, and carbon and nitrogen cycling. It is used by researchers to investigate a wide range of phenomena, including the impacts of land use change, climate change, and natural disturbances on ecosystem dynamics and the Earth's climate system. Overall, the Community Land Model is a powerful tool for studying the complex interactions between the land surface and the atmosphere, and for better understanding how different environmental factors influence Earth's ecosystems.