In a microservices architecture, services shall be as loosely coupled as possible. Still, they need to communicate with each other in order to fulfill business requirements. Now there are so many questions about this communication: What are the general possibilities to communicate? For example synchronous, asynchronous, or event-driven communication. What are the tradeoffs and which communication style should you prefer? What is the influence on the coupling of your services? For example, asynchronous communication reduces temporal coupling between services. What do I have to consider when selecting a certain communication style? For example, you need to apply certain resilience patterns if you want to use synchronous communication. This talk will help you answer these questions for your project. You will better understand not only the architectural implications, but also the effect on the productivity of your teams.