From the Project Management Institute (PMI) website:

With more than half a million members and credential holders in over 170 countries, PMI is the leading membership association for the project management profession.

PMI is the world’s leading not-for-profit association for the project management profession. PMI is recognized for the advocacy programs we conduct with governments, organizations and industries around the world as they recognize and embrace project management to achieve business results.

Organization website:  Project Management Institute