The Principles and Practice of Engineering (PE) exam is a professional certification test for engineers in the United States. It assesses an engineer's competency in their specific discipline, ensuring they have the necessary knowledge and skills to practice independently. Passing the PE exam is often a requirement for obtaining a professional engineering license. The exam typically covers a wide range of topics relevant to engineering practice, including ethics, project management, and technical principles. It is designed for engineers who have gained sufficient work experience, usually four years, under the supervision of a licensed engineer, often referred to as a Professional Engineer (PE).