A serverless, fully managed NoSQL document database with real-time sync and SDKs for web and mobile apps. It scales automatically and supports transactions. It is the evolution of Cloud Datastore.
In CDL it is the choice for web and mobile apps that need flexible data and real-time sync (user profiles, catalogs, session state). Question: a mobile app that syncs data across devices without managing servers → Firestore.
Firestore is a concept that can show up on the exam. Check the full guide to see it in context.