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Sandbox

Definitions:

  A system that allows an untrusted application to run in a highly controlled environment where the application’s permissions are restricted to an essential set of computer permissions. In particular, an application in a sandbox is usually restricted from accessing the file system or the network. A widely used example of applications running inside a sandbox is a Java applet.
Sources:
NIST SP 800-95 from NIST ITL Bulletin, Mar. 2000

  A restricted, controlled execution environment that prevents potentially malicious software, such as mobile code, from accessing any system resources except those for which the software is authorized.
Sources:
CNSSI 4009-2015 under sandboxing

  Isolating each guest OS from the others and restricting what resources they can access and what privileges they have.
Sources:
NIST SP 800-125 under Sandboxing

  A restricted, controlled execution environment that prevents potentially malicious software, such as mobile code, from accessing any system resources except those for which the software is authorized (Under Sandboxing).
Sources:
NIST SP 1800-21B from CNSSI 4009-2015