KPMG is a global network of professional services firms, one of the "Big Four," offering Audit, Tax, and Advisory services to businesses, governments, and non-profits worldwide, known for its deep industry knowledge, technological focus (like AI and ESG), and commitment to quality, integrity, and driving sustainable solutions for clients in over 140 countries. The name stands for Klynveld Peat Marwick Goerdeler, stemming from a 1987 merger, and it operates through independent member firms that are legally distinct but work collaboratively.