Zing Database is a distributed key-value database developed by Zing to handle their large volumes of data from feeds, user profiles, and comments in a highly available and scalable way. It uses a peer-to-peer architecture with consistent hashing for distributed addressing and data partitioning across multiple storage nodes, and supports features like caching, write-ahead logging, and replication for fault tolerance. The document discusses the architecture, distribution approach, and configuration options of the Zing Database system.