Immunity Challenge

Immunity is the attribute of being safe from elimination. It is present in many reality shows, and in Survivor is is acquired by the contestants in many ways.

Tribal Immunity
Before the merge, when there are at least two tribes competing, the tribes compete in a challenge before every tribal council to win the immunity idol. The idol is different every season, but if a tribe wins it, they do not have to go to tribal council no matter what. If there are more than two tribes, multiple tribes can win immunity. Sometimes immunity challenges are combined with reward challenges.

In some rare cases, there are double eliminations and both tribes go to tribal council. In this case, there is an individual immunity challenge.

Individual Immunity
After the merge (and in rare cases before the merge) the contestants compete in individual challenges to win the immunity necklace, which guarantees safety at tribal council. Individual immunity is transferable. No votes can be cast for the player with the immunity necklace.

Hidden immunity idol
Hidden on Exile Island or around the camps, a hidden immunity idol was introduced in . Clues are available for certain players in certain situations. The hidden idol can be kept a secret or not, and each season has different rules for the idol's use. Unlike the immunity necklace which doesn't allow anybody to cast a vote for the immune, the idol is usually played after the vote, nullifying and votes cast for that individual.