Tribes

 are competing teams in the 703 Survivor seasons. Tribes usually have between four to eleven people at the beginning of the game; the largest tribe was Tarachi, which had 16 people at its peak, while the smallest are the tribes of Survivor: Chaos, which originally had 2 players.

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

In Survivor: Wales, the castaways were initially not assigned into a tribe. There was a Day 1 Challenge, in which the highest scoring female and highest scoring male would be responsible for starting the Schoolyard Pick.

Trivia

 * Blue is the most used tribe color with it being used 22 times.
 * Purple is the most recurring tribe color; having been used 12 consecutive times.
 * Brown is the most unused tribe color as it has been used only twice.
 * Purple, Blue, Green are the most common merge colors, being used four times each.