A delegate is an active union member who is recognised in the workplace as the local union contact. Delegates play a vital role in being the two-way link between members in the workplace and other union structures, such as the local Branch Committee.
An active union member might volunteer to be the local delegate, or they might be approached by the Branch Organiser of a Branch Committee member to consider being a delegate.
To be most effective, a delegate should have the support and respect of their union colleagues in that workplace. A good way to have this recognised is for a workplace meeting of union members to informally elect the local delegate.