ETAP (Electrical Transient and Analysis Program) is a software used in electrical power systems design, analysis, optimization, and simulation. It allows engineers to simulate, monitor, and diagnose electrical networks, perform load flow analysis, fault analysis, protective device coordination, transient stability analysis, and more. ETAP is widely used in industries such as power generation and transmission, renewable energy, transportation, chemical, and manufacturing. It is a specialized skill used by electrical engineers and power system analysts.