Docker plays a crucial role in DevOps by encapsulating applications along with their dependencies into lightweight, standalone containers. This addresses the “it works on my machine” issue by guaranteeing that applications operate uniformly across various environments, from development to production. In a DevOps pipeline, Docker accelerates continuous integration and delivery (CI/CD) by normalizing build, test, and deployment environments. Additionally, it facilitates microservices architectures, enhancing scalability and resource efficiency.