Contacts may be created for a specific Client or as a standalone record.
They are generally considered different to a Resource/Candidate however a Contact may also be held on your Tracker system as a Resource/Candidate by selecting the Create Associated Resource option in the Touchbar.
You can action multiple Contacts by checking the box for all or individual records from within a Contact list and selecting Action selected record(s).
Check the Touchbar from within a Contact record to see all other available actions.
You have the following options from this Help menu: