These compact, self-contained systems bring data processing, storage, and networking closer to the source of data generation—enhancing performance, reducing latency, and improving data security. Micro-module data centers have achieved stepped technological evolution through an innovative "prefabricated, intelligent, and product-oriented" architecture. In the early stage, they mainly adopted closed cold aisle combined with air cooling. In this guide of gbc engineers, we'll explore the fundamentals of micro data centers, their components. This article objectively examines the concept, definition, origins, development, applications, and potential universality of micro data‑center modules, evaluating their technical advantages, cost implications, and suitability for both large internet enterprises and traditional data‑center. Standardized, pre-assembled and integrated data center modules, also referred to in the data center industry as containerized or modular data centers, allow data center designers to shift their thinking from a customized “construction” mentality to a standardized “site integration” mentality. This is why making the choice between them comes as a strategic decision for many organizations. In the article, we're going to discuss the specifics of both models, outline. From “Engineering Project” to “Standardized Product”: Through prefabrication in factories, subsystems such as power, cooling, and cabling are integrated into standard modules.