PRINCE2 (PRojects IN Controlled Environments) is a project management methodology designed to ensure effective project delivery within a structured framework.  It emphasizes a stage-gate process, dividing the project lifecycle into well-defined phases with clear deliverables and decision points.  PRINCE2 promotes a balance between project justification, business alignment, risk management, and continual justification throughout the project lifecycle.  It provides a comprehensive framework for project planning, execution, and control, making it a widely adopted methodology across various industries.