Software Engineering is a disciplined and systematic approach to designing, developing, testing, and maintaining software applications. It integrates principles from computer science, engineering, and project management to create reliable, efficient, and scalable software systems. Software engineers focus on requirements analysis, software design, coding, testing, and quality assurance, ensuring that software meets user needs and performs effectively. The field emphasizes best practices, methodologies, and tools for managing complex software projects, fostering collaboration, and delivering high-quality software products within specified timelines and budgets.