The Systems development life cycle (SDLC), or Software development process is a process of
 creating the information systems, and the models and methodologies that people use
 to develop these systems.
 
The System Development Life Cycle framework provides a sequence of activities for system
 designers and developers to follow. It consists of a set of steps or phases in which
 each phase of the SDLC uses the results of the previous one. Here shows the Typical
 Software Development Life Cycle.
 
Systems analysis, requirements definition: Defines project goals into defined functions and
 operation of the intended application. Analyzes end-user information needs.
 
Systems design: Describes desired features and operations in detail, including screen
 layouts, business rules, process diagrams, pseudocode and other documentation.
 
Development: The real code is written here.
 Integration and testing: Brings all the pieces together into a special testing environment
 , then checks for errors, bugs and interoperability.
 
Acceptance, installation, deployment: The final stage of initial development, where the software
  is put into production and runs actual business.
 
Maintenance: What happens during the rest of the software's life: changes, correction,
 additions, moves to a different computing platform and more. This is often
 the longest of the stages.
 
To manage this level of complexity, a number of SDLC models or methodologies have been created,
 such as "waterfall"; "spiral"; "Agile software development"; "incremental";

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