21vianet Group is a leading provider of data center services and value-added telecommunications services in China, operating a portfolio of self-built and acquired data centers across major cities to serve internet companies, financial institutions, government entities, and telecommunications carriers. The company generates revenue primarily through capacity-based pricing for colocation and managed hosting services, along with fees from complementary value-added services such as network transmission and cloud computing. VNET's business capitalizes on strong underlying demand driven by rapid digital transformation and internet traffic growth in China, positioning itself as a key infrastructure provider in an emerging market with significant supply constraints relative to developed economies.