21Vianet Group, Inc. is a carrier-neutral Internet data center services provider in China. The Company hosts its customers' servers and networking equipment and provides interconnectivity to improve the performance, availability and security of their Internet infrastructure. The Company also provides managed network services to enable customers to deliver data across the Internet in a faster and reliable manner through its data transmission network and smart routing technology. The Company provides complementary Internet infrastructure services, such as content delivery network (CDN) services, virtual private network (VPN) services and last-mile wired broadband services to improve the security, speed and quality of data transmission in China. It offers public cloud services, private cloud and hybrid services. In addition, the Company also offers container-based data center service.