Software engineering is an engineering approach for software development. A small program can be written without using software engineering principles. But if one wants to develop a large software product, then software engineering principles are necessary to achieve a good quality software cost effectively.
Without using software engineering principles it would be difficult to develop large programs. In industry it is usually needed to develop large programs to accommodate multiple functions. A problem with developing such large commercial programs is that the complexity and difficulty
levels of the programs increase exponentially with their sizes.
) A software engineer is responsible for the design and implementation of a variety of software solutions. They might be involved in the design and testing of anything from computers games and business applications, to operating systems and advanced software for the control of highly technical hardware and equipment. Once the system had been fully designed software
engineers then test, debug, and maintain the systems.