Alibaba Object Storage Service (OSS) provides massively scalable, secure, and durable object storage for unstructured data including images, videos, documents, backups, and log files. The platform offers 99.9999999999% (twelve 9s) data durability through automatic data replication across multiple availability zones and devices. Storage classes cater to different access patterns: Standard for frequently accessed data, Infrequent Access (IA) for data accessed monthly, Archive for long-term retention with rare access, and Cold Archive for regulatory compliance with extremely low costs.