There are generally considered to be four main types of religious organizations: churches, sects, denominations, and cults. Churches are large, mainstream religious bodies that represent major world religions. Sects are smaller, committed groups that form in protest of churches. Denominations were once sects that became institutionalized over time. Cults have flexible membership and disagreements exist around their precise definition, but they tend to focus on individual experiences and bringing like-minded people together. Religious organizations can also be classified as world-affirming, world-rejecting, or world-accommodating based on their relationship to secular society.