A virtual container is a lightweight, isolated software package that includes everything needed to run an application, such as code, runtime, system tools, and libraries. Containers use the host system’s operating system kernel, making them more efficient and faster to start than traditional virtual machines. They provide a secure and consistent environment for applications, regardless of where they are deployed. In cybersecurity, containers help isolate applications from each other and the host system, reducing the attack surface and improving security. Popular container platforms include Docker and Kubernetes.