Cloud Firestore

A flexible, scalable NoSQL document database for mobile, web, and server development from Google Cloud.

Cloud Firestore delivers seamless data synchronization across client apps through realtime listeners and robust offline support. It handles complex hierarchical data structures using documents and collections, scaling automatically to meet global demand. Developers benefit from ACID transactions, powerful multi-field indexing, and a serverless architecture that integrates directly with Firebase Authentication and Google Cloud Functions. With a 99.999% availability SLA on multi-region instances, it eliminates the overhead of database management (sharding, replication, and maintenance) so teams can focus on shipping code.

https://firebase.google.com/docs/firestore