A domestic violence order (DVO) is a law-paper from the police or a judge. A DVO has rules to protect people from domestic violence. A DVO can make rules about what a person can do. For example, a no-contact DVO means no going near, calling, texting, or contacting the person protected by the order. A non-intoxication order means no alcohol or drugs.
If someone breaks the rules of a DVO they are doing a crime.
When the police make the DVO it only lasts until a judge talks about it in court. The judge decides if the DVO keeps going and what rules it has.