Container lifecycle management encompasses the complete journey of a container from creation through termination, including state transitions, process handling, and cleanup. Understanding lifecycle mechanics is critical for building resilient containerized applications that start correctly, handle signals gracefully, and shut down without data loss or dropped connections. The most common pitfall is the PID 1 problem—when your main process doesn't properly reap zombie children or handle termination signals, leading to resource leaks and unclean shutdowns that orchestrators like Kubernetes misinterpret as application failures.