The Island is a reality survival show hosted by "survival expert" Bear Grylls. Participants, who are supposedly regular Brits who have little to no experience in island survival, are marooned on pacific islands with only a handful of supplies and are expected to work out their survival on their own.
For 6 weeks, participants are to survive by building shelters, starting their own fires without modern means, hunting for food, and gathering fresh drinking water. The show is filmed entirely by the participants themselves with emergency response teams supposedly nearby on another island to provide support if needed. Bear explains it as an experiment. To show whether or not modern day Brits, who are so used to modern conveniences still has what it takes to survive.