The difference between Sandbox and Userland
When used as nouns, sandbox means a children's play area consisting of a box filled with sand, whereas userland means a conceptual space outside the kernel in which a user's applications can run without the risk of damage to the operating system.
Sandbox is also verb with the meaning: to restrict (a program, etc.) by placing it in a sandbox.
check bellow for the other definitions of Sandbox and Userland
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Sandbox as a noun (US):
A children's play area consisting of a box filled with sand.
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Sandbox as a noun:
A box filled with sand that is shaped to form a mould for metal casting.
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Sandbox as a noun:
A container for sand or pounce, used historically before blotting paper.
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Sandbox as a noun:
An animal's litter box.
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Sandbox as a noun (rail):
A box carried on locomotives, from which sand runs onto the rails in front of the driving wheels, to prevent slipping.
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Sandbox as a noun (computing):
An isolated area where a program can be executed with a restricted portion of the resources available.
Examples:
"Running a program in a sandbox can prevent it from doing any damage to the system."
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Sandbox as a noun (Wiktionary and WMF jargon):
A page on a wiki where users are free to experiment without destroying or damaging any legitimate content.
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Sandbox as a noun (US, military, slang, usually "The Sandbox"):
The Middle East.
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Sandbox as a verb (computing, transitive):
To restrict (a program, etc.) by placing it in a sandbox.
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Userland as a noun (computing, informal):
A conceptual space outside the kernel in which a user's applications can run without the risk of damage to the operating system.