"Ch'tis" is a term used to refer to the people and culture of the Nord-Pas-de-Calais region in northern France. The term is derived from the local dialect, known as Ch'ti, which is a variant of the Picard language. The Ch'tis are known for their distinct customs, hearty cuisine, and warm hospitality. The popularity of the Ch'tis culture surged with the release of the 2008 film "Bienvenue chez les Ch'tis," which humorously portrays the life and traditions of the region. This film helped to highlight the unique identity of the Ch'tis and fostered a sense of pride among the local population.