Container isolation is a cybersecurity practice that separates applications or services within lightweight, virtualized environments called containers. Each container runs independently with its own resources, libraries, and dependencies, ensuring that processes inside one container cannot directly interact with those in another. This separation enhances security by limiting the impact of a potential compromise to a single container, preventing attacks from spreading across the system. Container isolation also improves efficiency and scalability, as containers share the host operating system kernel but remain logically segregated. This approach is widely used in cloud computing and DevOps workflows to manage applications securely and efficiently.