Does the sandbox use real money?

Could you elaborate on whether the sandbox environment utilized in cryptocurrency and finance simulations involves the use of actual, physical currency? Is it a fully simulated platform where transactions are merely representative of what would occur in a real-world setting, or does it involve the exchange of real money? Understanding the nature of the sandbox is crucial for those interested in testing financial strategies and models without incurring potential financial losses. Could you clarify whether there is any risk associated with utilizing the sandbox for financial transactions?