Microservice architecture offers opportunities and challenges, particularly in ensuring effective communication between loosely-coupled services. Service discovery is a vital component that facilitates this communication by automatically detecting, registering, and sharing service locations. The text explores the role of DNS in service discovery, highlighting its limitations for dynamic environments, and compares client-side and server-side service discovery models. Client-side discovery requires the client to locate services, allowing for direct interaction without extra routing, while server-side discovery centralizes the process, reducing client workload but potentially requiring load balancing for the central server. The serverless platform Koyeb is mentioned as a solution that provides server-side service discovery and service mesh, enabling flexible deployment and scaling of microservices without the need for managing infrastructure.