Simplify the following text for a Grade 12 native English-speaking person.
Original: An intensive care unit ( ICU ) , critical care unit ( CCU ) , intensive therapy unit , or intensive treatment unit ( ITU ) is a specialized department in a hospital that provides intensive-care medicine .
Simplified: An intensive care unit ( ICU ) , critical care unit ( CCU ) , intensive therapy unit ( ITU ) , or intensive treatment unit ( ITU ) is a special part of a hospital .