Shangri-La is a fictional paradise described in the 1933 novel "Lost Horizon" by James Hilton. It is depicted as a hidden, utopian valley in the Himalayas, where inhabitants live in peace and harmony, untouched by the outside world. The concept symbolizes an idealized place of happiness and tranquility. The term "Shangri-La" has since entered popular culture, representing any idyllic location or state of bliss. It often evokes images of lush landscapes, serene environments, and a sense of eternal youth, making it a popular reference in literature, film, and tourism.