Challenges are a very important part of Survivor.  They consist of difficult physical and mental games.  The stakes are always high. Either a reward of food and supplies or Immunity, which secures your freedom in the game, is what the winner will receive. Many of the challenges are about how much you are willing to endure to stay in the game. At first, the challenges are between two different tribes. These require teamwork and collaboration to win. After the merge, it becomes an individual game so the games are about a single person winning.
There are a few challenges that have been used multiple times and are now referred to as “Survivor Classics.” One of these is hanging onto a pole for as long as possible or eating a strange local cuisine. Jeff