Object Owner
An object owner is the user who creates a particular database object and can perform any operation on that object. By default, only an owner (or a superuser) can act on a database object. In order to allow other users to use an object, the owner or superuser must grant privileges to those users using one of the GRANT Statements.
Note: Object owners are PUBLIC users for objects that other users own.
See About Database Privileges for more information.