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Sandbox glossary

Plain definitions of the terms used on provider pages: isolation types, billing units and limits.

17 terms · Updated Oct 13, 2026

A

Active CPU billing
CPU is charged only while your code is using it.

B

BYOC
Bring your own cloud: the provider runs sandboxes inside your cloud account.

C

F

G

I

Idle timeout
How long a sandbox can sit unused before the provider stops it.

M

MicroVM
A small virtual machine with its own kernel that starts in a fraction of a second.

P

Pause and resume
Stop a sandbox and start it later with its files, and sometimes its memory, intact.

S

U

User-space kernel
A kernel that runs as a normal program and handles a sandbox's system calls.

V

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