Wendy's is an American international fast food restaurant chain founded by Dave Thomas on November 15, 1969, in Columbus, Ohio, United States.he same year Wendy's became the first fast-food chain to introduce the salad bar. Wendy's entered the Asian market by opening its first restaurants in Japan in 1980, in Hong Kong in 1982 and in the Philippines and Singapore in 1983. In 1984 Wendy's opened its first restaurant in South Korea.