In computing, a sandbox is an isolated testing environment where developers can experiment, test new features, or troubleshoot problems without affecting real production systems or data. Sandboxes replicate production environments but are separated so that bugs, errors, or experiments can't harm actual users or data. Software development teams use sandboxes to test code before deployment. Cybersecurity sandboxes safely analyze suspicious files or software. For government digital services, sandboxes allow testing new features before public release. The term comes from children's sandboxes—contained spaces for safe play. Sandbox environments are essential for responsible software development and security analysis.