# FLModel We define a standard data structure [`FLModel`](../apidocs/nvflare.app_common.abstract.fl_model.md#module-nvflare.app_common.abstract.fl_model) that captures the common attributes needed for exchanging learning results. This is particularly useful when NVFlare system needs to exchange learning information with external training scripts/systems. The external training script or system only needs to extract the required information from the received FLModel, run local training, and put the results in a new FLModel to be sent back. For a detailed explanation of each attribute, please refer to the API doc: [`FLModel`](../apidocs/nvflare.app_common.abstract.fl_model.md#module-nvflare.app_common.abstract.fl_model)