ISO is the International Standards Organizations. They do not create standards but provide a means of verifying that a proposed standard has met certain requirements for due process, consensus, and other criteria by those developing the standard.
The IEEE (Institute of Electrical and Electronics Engineers, Inc.) is the world's leading professional association for the advancement of technology. It is an organization of engineers, scientists and students involved in electrical, electronics, and related fields. It also functions as a publishing house and standards-making body.
Your vote on this answer has already been received
ISO is an international standard-setting body composed of representatives from various national standards bodies
The IEEE, Institute of Electrical and Electronics Engineers or IEEE (pronounced as eye-triple-e) is an international non-profit, professional organization for the advancement of technology related to electricity