In this chapter, we have mastered the basics of microservices. Simply put, a microservice is a compact web server that handles specific tasks. For example, microservices can be responsible for user authentication or for email notifications. They make running units reusable. This means you don't need to recompile or restart units if they don't require any updates. This approach is simpler and more reliable in deployment and maintenance.

We have also discussed how to split a monolithic web server that contains all of its business logic in a single unit into smaller pieces and join them together through communication, in line with the ideology of loose coupling. To split a monolithic server, you should separate it into domains that are classified by what tasks the servers carry out.

In the last section of this chapter, we've looked at why Rust is a good choice for developing microservices. We touched on dependencies management, the performance of Rust, its explicit nature, and its toolchain. It's now time to dive deep into coding and write a minimal microservice with Rust.

In the next chapter we will start to writing microservices with Rust using hyper crate that provides all necessary features to write compact asynchronous HTTP server.