A secure VM is an isolated virtual machine used to run a workload with tighter boundaries than a normal app process or shared server. It relies on virtualization and hardened configuration to keep the guest separated from other systems, even if the workload is exposed to hostile input or a bug. In practice, this isolation helps contain compromise and limits lateral movement if code inside the VM is abused.
In cyber security, secure VMs are used to protect high-risk tasks such as opening untrusted files, handling agent tool calls, or processing sensitive data. Defenders pair them with narrow network access, separate credentials, and logging so actions can be reviewed later. Attackers may still try to escape, misuse connected services, or exploit overly permissive bridges between the VM and the rest of the environment, so isolation is strongest when permissions are kept minimal.