Database systems that don't use traditional SQL structure, designed for flexible data storage. Like having different filing systems optimized for different types of information.
Social media platforms use NoSQL databases to store user posts, photos, and interactions in flexible formats.
All are managed NoSQL databases. DynamoDB and Oracle NoSQL are key-value/document-focused services; Cosmos DB is a multi-model NoSQL database (document, key-value, graph, column-family) with global distribution; Firestore is a document database commonly used for web/mobile apps with real-time sync.