gVisor is an application kernel written in Go that implements a substantial portion of the Linux system surface to provide container isolation. The tool includes an Open Container Initiative (OCI) runtime called runsc that creates an isolation boundary between applications and the host kernel. This runtime integrates with Docker and Kubernetes environments to enable sandboxed container execution. Unlike traditional containers that share the host kernel directly, gVisor acts as an intermediary application kernel that limits the host kernel surface accessible to containerized applications. The system runs as a normal process on the host while providing applications access to expected Linux features. gVisor addresses container security concerns by implementing Linux system calls through its own kernel rather than passing them directly to the host kernel. This approach reduces the attack surface and provides additional isolation beyond standard container mechanisms. The tool does not require fixed physical resources and leverages existing host kernel functionality while maintaining compatibility with standard container orchestration platforms.