Project Portfolio Management (PPM) is the centralized governance and coordination of an organization's collection of projects, programs, and initiatives to achieve strategic business objectives. It operates at the intersection of strategy and execution, allocating finite resources—budget, talent, time—across competing demands to maximize organizational value rather than individual project success. PPM differs fundamentally from project management: where project managers deliver specific outputs on time and within scope, portfolio managers continuously optimize the entire mix of investments to ensure strategic fit, balance risk and reward, prevent resource conflicts, and adapt the portfolio as business priorities shift. The core challenge is not doing projects right, but doing the right projects—and knowing when to accelerate, pause, or kill initiatives based on changing conditions and portfolio-level constraints.