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.
NIST SP 800-95
(NIST ITL Bulletin, Security Implications of Active Content)
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.
NIST SP 800-179 under Sandboxing
(NISTIR 7298 Rev. 2)
CNSSI 4009-2015 under sandboxing
Isolating each guest OS from the others and restricting what resources they can access and what privileges they have.
NIST SP 800-125 under Sandboxing