Sandbox is a security mechanism for containing untrusted programs. Such programs could contain malicious code, which would harm the user's system.
In computer security, a sandbox is a security mechanism for separating running programs. It is often used to execute untested code, or untrusted programs from unverified third parties, suppliers, untrusted users and untrusted websites.
Web Browsers such as 
google-chrome and firefox using varying sandboxing techniques, to protect the users from malicious code infecting the system.
Other common types of software which use sandboxing techniques are Virtualization software. Which allow a user to run programs within a confined environment, known as the Guest OS. The Guest OS is hosted on the Host OS, which is the main Operating System running on the system. Any harm or damages caused by any malicious programs hosted on the Guest OS, will be contained within thus not spreading to the Host OS. Thus allowing the user to resume his work without experiencing any setbacks.
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