Firestore

Firestore is a NoSQL document database provided by Google Cloud, designed for mobile, web, and server application development with real-time synchronization capabilities. Unlike relational databases that enforce schema and ACID transactions across tables, Firestore stores data in flexible document collections, enabling rapid iteration and horizontal scaling — though this flexibility trades query expressiveness for operational simplicity, making it unsuitable for workloads requiring complex joins or strong consistency guarantees across multiple documents.