The 1896 Summer Olympics, officially known as the Games of the I Olympiad, was a multi-sport event celebrated in Athens, Greece, from 6 to 15 April 1896. It was the first international Olympic Games held in the Modern era. Because Ancient Greece was the birthplace of the Olympic Games, Athens was perceived to be an appropriate choice to stage the inaugural modern Games. It was unanimously chosen as the host city during a congress organized by Pierre de Coubertin, a French pedagogue and historian, in Paris, on June 23, 1894. The International Olympic Committee (IOC) was also instituted during this congress.

Despite many obstacles and setbacks, the 1896 Olympics were regarded as a great success. The Games had the largest international participation of any sporting event to that date. The Panathinaiko Stadium, the only Olympic stadium used in the 19th century, overflowed with the largest crowd ever to watch a sporting event. The highlight for the Greeks was the marathon victory by their compatriot Spyridon Louis. The most successful competitor was German wrestler and gymnast Carl Schuhmann, who won four events.

The Summer Olympic Games or the Games of the Olympiad are an international multi-sport event, occurring every four years, organized by the International Olympic Committee. Medals are awarded in each event, with gold medals for first place, silver for second and bronze for third, a tradition that started in 1904. The Winter Olympics were also created due to the success of the summer Olympics.

The olympics have increased from a 42-event competition with fewer than 250 male athletes to a 300-event sporting celebration with over 10,000 competitors from 205 nations. Organizers for the 2008 Summer Olympics in Beijing expected approximately 10,500 athletes to take part in the 302 events on the program for the games.

The United States has hosted four Summer Olympics Games, more than any other nation. The United Kingdom will have hosted three Summer Olympics Games when they return to the British capital in 2012, all of them have been (and will be) in London, making it the first city to hold the Summer Olympic Games three times. Australia, France, Germany and Greece have all hosted the Summer Olympic Games twice. Other countries that have hosted the summer Olympics are Belgium, China, Canada, Finland, Italy, Japan, Mexico, Netherlands, South Korea, Spain, the Soviet Union and Sweden. In the 2016 Summer Olympics, Rio de Janeiro will host the first Summer Games in South America. Four cities have hosted two Summer Olympic Games: Los Angeles, London, Paris and Athens. Stockholm, Sweden, has hosted events at two Summer Olympic Games, having hosted the games in 1912 and the equestrian events at the 1956 Summer Olympics—which they are usually listed as jointly hosting. Events at the summer Olympics have also been held in Hong Kong and the Netherlands (both represented by their own NOCs), with the equestrian events at the 2008 Summer Olympics being held in Hong Kong and two sailing races at the 1920 Summer Olympics being held in the Netherlands.