Explain the Evolution of a Software ?

Software:  Software is considered to be collection of executable programming code.

Engineering :  Engineering  on the other hand, is all about developing products, using well-defined, scientific principles and methods.

Software engineering: Software engineering  is an engineering branch associated with development of software product using well-defined scientific principles, methods and procedures.

The process of developing a software product using software engineering principles and methods is referred to as Software Evolution. This includes the initial development of software and its maintenance and updates, till desired software product is developed, which satisfies the expected requirements.

               Evolution starts from the requirement gathering process. After which developers create a prototype of the intended software and show it to the users to get their feedback at the early stage of the software product development. The users suggest changes, on which several consecutive updates and maintenance keep on changing too. This process changes to the original software, till the desired software is accomplished.

              Even after the user has the desired software in hand, the advancing technology and the changing requirements force the software product to change accordingly. Re-creating software from scratch and to go one-on-one with the requirement is not feasible. The only feasible and economical solution is to update the existing software so that it matches the latest requirements.