BitMEX Testnet is a simulated environment specifically for testing and practising trading strategies without using real funds. It allows traders to experience the functionalities of the platform, execute trades, and access market data in a risk-free setting.
It's highly recommended for novice traders who want to gain experience and confidence in their trading skills before transitioning to live trading with real funds. It's also helpful for experienced traders to refine their strategies and validate their trading algorithms without risking their capital.