NoSQL database that stores data in document format, typically JSON-like structures. Like having a flexible filing system where each folder can contain different types of documents.
Content management systems use document databases to store articles with different structures and metadata.
All provide managed NoSQL services that can store JSON-like documents and scale horizontally. AWS DocumentDB focuses on MongoDB-compatible document workloads; Azure Cosmos DB supports multiple APIs including a native document model and MongoDB; GCP Firestore is a document database commonly used for web/mobile apps; OCI Oracle NoSQL Database supports document-style JSON data and key-value access patterns.