SE, or Systems Engineering, is an interdisciplinary field that focuses on designing and managing complex systems over their life cycles. It integrates various engineering disciplines and specialty groups to ensure that all aspects of a project are considered, from initial requirements to final delivery. The goal of SE is to optimize system performance while balancing factors such as cost, schedule, and risk. It employs a structured approach, often using models and simulations, to analyze and improve system functionality, reliability, and efficiency, making it essential in industries like aerospace, defense, and information technology.