A voluntary association or union (also sometimes called a voluntary organization, unincorporated association, or just an association) is a group of individuals who enter into an agreement as volunteers to form a body (or organization

Organization

An organization is a social group which distributes tasks for a collective goal. The word itself is derived from the Greek word organon, itself derived from the better-known word ergon - as we know `organ` - and it means a compartment for a particular job.There are a variety of legal types of...

) to accomplish a purpose.

Strictly speaking, in many jurisdiction

Jurisdiction

Jurisdiction is the practical authority granted to a formally constituted legal body or to a political leader to deal with and make pronouncements on legal matters and, by implication, to administer justice within a defined area of responsibility...

s no formalities are necessary to start an association. In some jurisdictions, there is a minimum for the number of persons starting an association.