This document discusses Core ML, an Apple framework for running machine learning models on Apple devices. It provides an overview of Core ML, how machine learning models are used with Core ML, and different approaches for creating models, including using pre-trained models, using the Create ML tool in Xcode, or building models from scratch using libraries like TensorFlow. It also provides clarification around common machine learning terms and their relationship to Core ML. The document encourages trying out Create ML to build a custom image classification or recommendation model in order to better understand Core ML.