Project management is the disciplined application of knowledge, skills, tools, and techniques to project activities in order to meet clearly defined requirements. At its core, it is about planning, organizing, and controlling resources so that specific goals are achieved within well-understood constraints. A project is a temporary endeavor, with a defined beginning and end, undertaken to create a unique product, service, or result. This distinguishes it from operations, which are the ongoing, repetitive activities that sustain a business day after day. Because projects are finite and unique, they require deliberate coordination that ordinary operational routines do not demand.
Every project is shaped by the triple constraints, sometimes called the iron triangle: scope, time, and cost. These three dimensions are interdependent, so that increasing scope typically pushes time or cost upward, and tightening the schedule often inflates cost or trims scope. Many practitioners also treat quality as a fourth constraint sitting at the center of the triangle, because it is influenced by how the other three are balanced. The person charged with navigating these trade-offs is the project manager, who plans, executes, and closes the project while leading the team, engaging stakeholders, and handling risks and changes along the way.
To bring consistency to this discipline, the Project Management Institute publishes the Project Management Body of Knowledge, or PMBOK. The PMBOK guide outlines standards, best practices, and terminology, and its current edition organizes content around ten knowledge areas and five process groups. It is also useful to distinguish project management from related concepts. A project delivers a unique outcome; a program coordinates a group of related projects to obtain benefits that none of them could achieve alone; and a portfolio is a collection of projects and programs aligned with strategic objectives. Understanding these levels helps organizations see how individual efforts roll up into broader strategy.