The term "Test Net" refers to a network or system that is used for testing and experimentation purposes. It can be used by developers, engineers, researchers, etc., to test new software, hardware, applications, protocols, algorithms, etc., in a controlled environment before deploying them on the main or live network. The Test Net allows users to identify any bugs, errors, security vulnerabilities, or other issues that may arise during testing and make necessary adjustments before launching the product or service on a larger scale. In essence, it is a safe space for experimentation and refinement of new ideas before they are implemented in real-world scenarios.