Core ML Tools (coremltools) is a Python package that converts trained machine learning models from popular frameworks such as TensorFlow, PyTorch, scikit-learn, XGBoost, and LibSVM into Apple’s Core ML format. It provides utilities for reading, writing, optimizing, and validating converted models, enabling developers to deploy ML models on Apple devices using Xcode. The tool ensures that converted models can be verified on macOS before integration into applications.