But you can also include objects simply for reference. A schema may include database objects owned by other users, but you can only alter objects that you own or have been granted the proper access to. Non-editable objects will appear grayed in the Schema Editor. A Commit saves your changes in the database. Nothing you do in the Schema Editor will take effect unless you commit it.
Public synonyms are accessible to all users.
If you omit this option, the synonym is private and is accessible only within its schema. Schema Is the schema to contain the synonym. If you omit schema, Oracle creates the synonym in your own schema. Synonym Is the name of the synonym to be created. FOR Identifies the object for which the synonym is created.