Microsoft Azure Custom Vision Training Client is a tool that allows users to train custom image recognition models for their specific use case. By providing a set of labeled images, users can create and fine-tune a machine learning model that can accurately classify and identify objects within images. The Training Client offers a user-friendly interface that guides users through the process of uploading data, labeling images, and training the model. This tool is particularly useful for companies or developers looking to create tailored image recognition solutions that meet their unique requirements. With the Custom Vision Training Client, users can easily build and deploy custom models that can improve the accuracy and efficiency of image recognition tasks.