Explain Docker networking modes and when to use each.

Docker networking modes: 1) Bridge (default): Containers on same host can communicate - Use for single-host applications, 2) Host: Container uses host network directly - Use for high-performance networking, port conflicts, 3) None: No networking - Use for security-sensitive applications, 4) Overlay: Multi-host networking for Swarm - Use for distributed applications, 5) Macvlan: Assigns MAC address to container - Use for legacy applications requiring direct network access. Examples: docker run --network=host nginx, docker network create mynet, docker run --network=mynet app.