This document is a service overview of ModelArts, a comprehensive AI development platform offered by Huawei Cloud. It details the functionalities and offerings of ModelArts, which include large-volume data preprocessing, semi-automated data labeling, distributed training, automated model building, and on-demand model deployment across various devices. The platform supports all stages of AI development, from data processing to algorithm development and model training. The architecture of ModelArts is described, highlighting its compute layer, AI platform layer, and AI development toolchain layer, which facilitate efficient resource management and automatic fault recovery. Additionally, the document outlines various offerings under ModelArts, such as ModelArts Standard, ModelArts Studio (MaaS), ModelArts Lite Server, ModelArts Lite Cluster, and ModelArts Edge, each tailored to specific user needs in AI development. The document emphasizes the flexibility and support for popular open-source AI frameworks, making it a versatile tool for developers.