Most nurses who provide private duty care are working one-on-one with individual clients. Sometimes such care is provided in the client's home, or an institution, such as a hospital, nursing home or other such facility.
Private duty nursing was a far more widespread practice prior to the introduction (in 1964) of intensive care units where nurses provide care to a limited number of clients in what is usually a more high-tech situation.
Private duty nursing is distinguished from caregivers who are not nurses (RN or LPN) (often called "sitters" in the US) who provide semi-skilled care (bathing and other hygiene assistance, assistance with eating, etc.) and companionship to clients. Such sitters often do minor housekeeping chores for their clients, but they are neither educated nor qualified to provide skilled nursing care.