The goal of this architecture is to decouple the front-end apps from the backend architecture.

As a scenario, think about you have an application that consists of the mobile app, web app and needs to communicate with the backend services in a microservices architecture.

This can be done successfully but if you want to make a change to one of the frontend services, you need to deploy a new version instead of stick to updating the one service.

So here comes the microservice architecture and this is able to understand what our apps need and how to handle the services.

This is a big improvement in microservice architecture as this allows to isolate the backend of the application from the frontend. One other advantage that we can get from this BFF is that we can reuse the code as this allows all clients to use the code from the backend.

Between the client and other external APIs, services, and so on, BFF functions similarly to a proxy server. If the request must pass through another component, the latency will undoubtedly increase

Read more: https://javarevisited.blogspot.com/2021/09/microservices-design-patterns-principles.html#ixzz7tpJ4ZlGZ