Pig show is a judged event or display where pigs compete to win various titles in each category. Pigs are scored on their market quality which includes muscle, fat, and body structure along with qualities they must possess for their specific breed. Other names for a pig show include swine show and hog show. A pig show is frequently part of a larger agricultural show.
Pig shows started out on farms where the owner and other pig farmers would gather to decide which pig had the best qualities for breeding.
A show is typically divided up into classes so that the judge can study fewer pigs at a time. The structure is made so that there are division champions and reserve champions and ultimately an over-all Grand Champion. 
In China, the first pig show was the Guangdong Breeding Pigs Auction which began January 18, 1996. Most pig shows in china are pig-breeding auctions. More than 10 provinces have in the past hosted these pig-breeding auctions, but only two provinces (Guangdong Province and Hubei Province) still host it.
In Australia, The Sydney Royal Easter Show Competition is held annually. The Sydney Royal Easter Show is one of the largest and most prestigious Pig Shows in Australia. It is held in Sydney, at the Paddington Pavilion. Pigs were exhibited at the first Sydney Royal Easter Show in 1858 and the pig competition has been held at nearly every show since. Exhibitors that compete at the Sydney Royal Pig Show are often from small family-based Stud farms.