Intensive care unit nurse or critical care nurses are registered nurses who specialize in providing care in intensive care units of hospitals. Intensive care nurses are always in demand. As health care becomes more advanced, the percentage of critically ill patients requiring expert care continues to rise. There is a great need for qualified intensive care unit nurses. Critical care nurses provide care in general ICU’s as well as within specialized units. Intensive care nurses sometimes provide care to people of all ages , however most provide care to either adults or children.