Google's mobile and web application development platform with real-time database and hosting. Like having a complete backend service that handles all server-side needs for mobile apps.
A chat application uses Firebase to store messages and instantly sync them across all users' devices.
Firebase is a Google-managed Backend-as-a-Service (BaaS) rather than a single IaaS/PaaS service. Other clouds offer comparable building blocks (auth, databases, hosting, serverless functions), but there is no one-to-one single service equivalent across AWS, Azure, or OCI.