Tribes

 are competing teams in the Survivor ORG seasons. A tribe has had anywhere from four to eleven people at the beginning of the game.

Dividing Into Tribes
Most commonly in Survivor, the tribes are divided by the moderators before the game begins.

Returnees vs. Newbies
Some seasons have had the contestants split between those who had played in a previous season, and those who hadn't.
 * Survivor: Cuba was the first season to implement this, pitting ten veterans from the previous two seasons and ten new players against one another. Unlike the other returnee vs. newbie seasons, the returnee tribe did not have an archetype.
 * Survivor: Madagascar,Survivor: Rome, and Survivor: Cyprus were Fans vs. Favorites themed. One tribe consists of new players, dubbed the Fans, while the other consists of memorable previous contestants, dubbed the Favorites. 
 * In a controversial twist, however, Madagascar split both fans and favorites evenly between both tribes.
 * Survivor: Cyprus further split the fans and favorites into two tribes of five each.
 * Survivor: Costa Rica had a third tribe consisting of players looking for a second chance among the two tribes of new players.

Attributes

 * Survivor: Indonesia and Survivor: Molise both used personality tests to sort contestants into four tribes of five.
 * Survivor: Sichuan and Survivor: Bali split contestants into three tribes based off of their main attribute: Brain, Brawn, or Beauty.
 * Survivor: Sri Lanka split contestants into two tribes based off of whether they were an introvert or an extrovert.

Anarchy
Used by both Survivor: Anarchy and Survivor: Alsace-Lorraine, Anarchy is a game-changing twist in which for the first stage of the game, no tribes are established. More often than not, the highest placing half will win immunity for a cycle while the lowest placing half will be vulnerable. Tribes are introduced later in the game.

Trivia

 * Blue and Yellow both currently hold the longest string of seasons, having been used six seasons in a row.
 * Blue is the most recurring color, having been used 30 times.
 * Brown is the least recurring tribe color, having been used only four times.
 * Blue and purple are the most common merged tribe colors, each having been used eight times.