Diagnostic systems are tools or methods used to identify and analyze problems or conditions in various fields, such as medicine, engineering, and information technology. In healthcare, for example, diagnostic systems help doctors determine the nature of a patient's illness through tests and examinations. These systems can include imaging techniques like X-rays and MRI scans, as well as laboratory tests that analyze blood or other samples. In engineering and IT, diagnostic systems are used to troubleshoot and resolve issues in machinery or software. They often involve monitoring systems that detect faults or performance issues, allowing technicians to pinpoint the source of a problem quickly. Examples include automated diagnostic tools for vehicles and software debugging tools for computer programs.