Efficiently developing dependable and high-quality software products within a strict timeframe should be a priority for those working within the technology sector. The Software Development Life Cycle (SDLC) process plays an integral role in this respect by offering various tried-and-tested methodologies such as Waterfall model Prototype model Spiral model Agile Incremental or Rapid Application Development model. Drawing from previous writings on this subject matter are used to investigate key SDCL principles outlined above.In this paper we are discussing about the SDLC phases and their different models.