Docker container and CI/CD integration can significantly improve development efficiency. In CI/CD workflows, Docker applications include: 1) using Docker containers as build environments to ensure build environment consistency; 2) using Dockerfile to build application images; 3) using docker-compose to start dependency services in test environments; 4) using Docker images as artifacts to standardize build outputs; 5) using Docker image registries to store and distribute images; 6) using Docker containers to run integration tests during testing; 7) using Docker containers to deploy to production environments. Common CI/CD tools: Jenkins, GitLab CI, GitHub Actions, CircleCI, etc., all provide Docker support.