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A simple definition of software engineering is to take an idea and turn it into a useful program.

A simple definition of software engineering is to take an idea and turn it into
a useful program. For the formal definition, it might sound something like, “An
organized, analytical approach to the design, development, use, and maintenance of
software.” Why is software engineering important? Producing a software application
is relatively simple concept, but there are countless ways that a simple concept can
go wrong. Building applications according to the simple concept has many
drawbacks, such as:

• Programmers may not understand what users want or need (which may be two
  separate things), so they build the wrong application.


• The application might be so full of bugs. Also, it cannot be enhanced over
  time.
  Software engineering includes techniques for avoiding sending your project down
  the road to failure. Building applications according to the formal definition is
  recommended due to the following:


• It Software engineering ensures the final application is effective, usable, and
  maintainable.


• It helps scheduling and producing a finished project on time and within
  budget.


• It gives you the flexibility to make changes to meet unexpected demands
  without completely altering your schedule and budget constraints.
  1.1 Software Engineering Steps
  The following sections describe the steps you need to keep a software
  engineering project on track.