The project life cycle is really just a highfalutin way of describing the life of a project. It describes the high-level process of delivering a project and the steps you take to make things happen. It’s how projects happen; how the phases of a project conduct a team from brief through to delivery. Every project has a start and end; it’s born, matures, and then “dies” when the project life cycle is complete.
The PMI (Project Management Institute) has defined these five process groups, or phases, which come together to form the project life cycle.