Sandboxing is a security technique used in computing to isolate programs and processes from each other. By creating a controlled environment, or "sandbox," software can run without affecting the rest of the system. This helps prevent harmful actions, such as malware spreading or unauthorized access to sensitive data. In a sandbox, applications can be tested safely, allowing developers to identify issues without risking the main system. This method is commonly used in web browsers, where JavaScript code can execute in a restricted space, ensuring that it cannot access the user's files or other applications directly.