SDLC refers to Software Development Life Cycle. It describes where the software development process begins and ends.

Software development is a process that allows the software to be created. In the context of software, it means that technology is developed, tested, modified and implemented in order to create applications or services.

The SDLC starts with defining what the product will be – an application or service – in terms of technical specifications. Once this is done, it moves on to what kind of technology will be used (the most important reason for doing this). What kinds of applications will be created? How will they work? What are their main advantages or disadvantages? Then comes how the application will look like and how it should perform in terms of interface design – usability issues that deal with ease-of-use and user.