Now, we are at a stage where we are well acquainted with the core concepts of microservices. The next question that we often interact with is regarding the implementation of microservices, and how they will interact with each other. The most common question is when to use orchestration, when to react, and is it possible to use a hybrid approach. In this section, we will understand each of the approaches, its pros and cons, and look at practical examples for the use of each approach. Let's start with orchestration.