Backend-as-a-Service, or BaaS, provides ready-made cloud backends so that a developer building a web or mobile front end does not have to design, write, and operate a server tier. Where Function-as-a-Service runs custom code, BaaS supplies the standard pieces most apps need - user authentication, a database, file storage, and push messaging - as managed services accessed through client SDKs and APIs.
Google’s Firebase is a canonical example. Its documentation describes “fully managed infrastructure” that lets developers “store and sync app data at global scale without managing servers,” a “secure, all-in-one identity platform” for authentication, a scalable NoSQL cloud database with realtime synchronization, and cloud-hosted storage for images, audio, and video. The stated goal is to let developers “focus on what matters most” while Firebase handles the infrastructure complexity. Supabase and the earlier Parse platform offer comparable backends.
The 2019 Berkeley paper “Cloud Programming Simplified: A Berkeley View on Serverless Computing” places this style of managed service within the broader serverless picture, where the provider handles the system administration that previously fell to application teams. BaaS and FaaS are the two halves of serverless: prebuilt backend components plus a place to run the custom logic that ties them together.
The trade-off is reduced control. BaaS data models, query capabilities, and security rules are defined by the provider, and an application becomes coupled to that provider’s APIs - so BaaS suits products that value speed of development over deep customization of the backend.