Definition - What does Sandbox mean?
In an implementation, a sandbox also may be known as a test server, development server or working directory.
Techopedia explains Sandbox
As one of the most common software testing techniques, a sandbox is useful in environments with one or more simultaneously operating software programs. A sandbox creates an operational environment in which the execution, operation and processes of software testing is not affected by other running programs.
Additionally, the sandbox technique is implemented in information security to evaluate suspicious software or files containing malicious code.
Typically, the source code of sandboxed software is not tested prior to isolation, which reduces unexpected behavior.