Terms beginning with S describe many of the places code runs and the safety nets around releasing it - sandboxes, staging, scaling and similar concepts. Every entry is a clear, citable definition you can read in a few seconds.
A sandbox is an isolated, on-demand environment for running, previewing or testing code without touching production. It has its own resources and data, so you can experiment, review a pull request or reproduce a bug freely - and throw the whole environment away when you are done.