Answers

1. The message queue gets a message and has a single subscriber dequeue it. If nothing dequeues a message, it stays in the queue indefinitely (the FIFO model). The Pub-Sub model gets a message and sends it to zero or more subscribers.
2. Event sourcing is the process of chronologically accumulating events that happened in a system instead of persisting in the current state of an entity. It allows you to recreate the entity’s state by replaying those events.
3. Yes, you can mix Gateway patterns.
4. No, you can deploy micro-applications (microservices) on-premises if you want to.
5. It separates generic functionalities from app-specific ones, promoting cleaner code and modularization. It also helps simplify the frontend.

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