A cooperative society is a voluntary association of individuals with a common economic purpose. It must have a minimum of 10 members and register under the Cooperative Societies Act of 1912. Cooperative societies have features like voluntary membership, limited liability, democratic control, and a service motive of mutual help rather than profit. They benefit members through equality, stability, lower costs, and government support, but can be limited by resources, management issues, and government control. Common types are consumers', producers', marketing, farmers', credit, and housing cooperatives.