21.1 An injunction is a judgment or order to do or refrain from doing a particular thing. It is either (a) interim or interlocutory, that is an order until the hearing of an action or further order; or (b) final or perpetual, that is a judgment determining and concluding the right in litigation. An injunction is also either (a) prohibitory or restraining, when it inhibits the doing of anything; or (b) mandatory, when it orders the doing or restoring of anything.