Association Codes (Also known as tokens) are used to provide a user access to their organization's subscribed content. An association code is generated for the organization and provided to the user. Once a user has entered the code in their personal 'account details/profile' area, their account is 'associated' with the organization's account and the user will have access to all content that has been activated for the organisation.

See also: How do I enter my association code for activating access?