The phases of SDLC are requirement analysis, feasibility and risk analysis, planning and design, development, testing, deployment, support, and maintenance.

SDLC or software development life cycle is a framework that defines the lifecycle of a software project from its initial stage to the completion stage. Some SDLC examples are the agile model, and traditional models like the spiral model and the waterfall model.

SDLC models define the methodology followed by the project team for the software development lifecycle process, from start to end. There are several SDLC models, like waterfall, V-model, spiral, Agile, and DevOps.