Service discovery is a cornerstone of scalable, resilient DevOps architectures. It enables dynamic service registration and lookup, facilitating seamless communication in microservices environments. This blog explores the principles, implementations, and best practices of service discovery, highlighting how it enhances automation, reduces downtime, and accelerates deployment cycles. Through practical examples and insights, readers will understand how to leverage service discovery tools like Consul, Etcd, and Kubernetes DNS to build more adaptive and robust systems.