Define what a Salesforce Sandbox is.

A Salesforce Sandbox is a testing environment that mimics the production environment. It allows users to create and manage changes, test new features, and perform experiments without risking the disruptions that could occur in the live system. This isolated environment enables developers and administrators to safely test configurations, build applications, and validate any changes before they are deployed to the live environment.

By simulating the conditions of the production environment, Sandboxes provide a space to ensure that new updates and features will perform as expected without interfering with existing operations or affecting the user experience. This is particularly valuable for organizations that need to ensure data integrity and application functionality in a controlled setting before going live.