Software engineering is a field of engineering, for design ing and writing programs for computers or other electronic devices. A software engineer, or programmer, writes software (or changes existing software) and compiles software using methods that improve it. Better quality software is easier to use.Software engineering is an engineering branch associated with development of software product using well-defined scientific principles, methods and procedures. The outcome of software engineering is an efficient and reliable software product.There are many ongoing research going on in the feild of sofware.Software Engineering gives a framework for software development that ensures quality. It is the application of a systematic and disciplined process to produce reliable and economical software.