The governing body of modern Olympics is the International Olympic Committee (IOC). The IOC is responsible for the organization and management of the Olympic Games, as well as promoting the Olympic Movement worldwide.

Key Points:
- International Olympic Committee (IOC) is the governing body of modern Olympics.
- The IOC is responsible for organizing and managing the Olympic Games.
- The IOC promotes the Olympic Movement worldwide.

Explanation:
The International Olympic Committee (IOC) is an international organization responsible for overseeing the modern Olympic Games. It was founded on 23 June 1894 by Pierre de Coubertin, a French educator and historian. The IOC is headquartered in Lausanne, Switzerland.

The IOC's main role is to ensure the successful organization and management of the Olympic Games. This includes selecting the host city for each edition of the Games, overseeing the planning and preparation of the event, and ensuring that the Games are conducted in accordance with the Olympic Charter.

The IOC also plays a crucial role in promoting the Olympic Movement worldwide. It works to encourage the development of sports and physical education, promote the values of Olympism, and foster international cooperation through sport. The IOC collaborates with National Olympic Committees (NOCs), International Federations (IFs), and other stakeholders to achieve these objectives.

The IOC consists of members from different countries who are elected or appointed based on their contributions to the Olympic Movement. The members represent various sports organizations, NOCs, and athletes. The IOC meets regularly to discuss and make decisions on matters related to the Olympic Games and the Olympic Movement.

In conclusion, the International Olympic Committee (IOC) is the governing body of modern Olympics. It is responsible for organizing and managing the Olympic Games, as well as promoting the Olympic Movement worldwide.