The Software Development Life Cycle (SDLC) is a method for designing, developing, and testing high-quality software in the software industry. The SDLC is designed to deliver high-quality software that meets or exceeds customer expectations and is completed on time and on budget.

The Software Development Life Cycle (SDLC) is a framework that defines the tasks that must be completed at each stage of the software development process. The international standard ISO/IEC 12207 governs software life-cycle processes. It aspires to be the industry standard for defining all software development and maintenance responsibilities. 

The various phases of SDLC are:

Step1: Planning

Step 2: Defining

Step 3: Designing 

Step 4: Building

Step 5: Testing

Step 6: Deployment