**[Fly Machines](/docs/machines/):** [Firecracker microVMs](https://firecracker-microvm.github.io/) that launch quickly in any [region supported by Fly.io](/docs/reference/regions/). A VM, or virtual machine, functions like a physical computer, but is software-based. Multiple VMs can run, completely isolated, on one physical host. If you've deployed an app on Fly.io, then it's running on Fly Machines. There’s a fast [REST API](/docs/machines/api/) to manage Machines, but you can also use flyctl—the Fly CLI—to manage everything from the command line. And then there’s Fly Launch, which combines flyctl commands with a shared config to manage your app’s Machines as a group.
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