Jersey is an island located in the English Channel just north of France. It's one of the Channel Islands. It is a British crown dependency, though it is not considered part of the United Kingdom or the European Union. The UK is responsible for its defense and its international representation.
The principal language of Jersey is now English, which is also the official language of the country. That wasn't always the case. Jèrriais, a Norman French language, was the main language of the island until the 20th century. Jèrriais is still spoken by a small percent of the population. There's a movement now to try to preserve it.