The Vietnamese word "nội thành" refers to the urban or inner areas of a city, particularly the parts that are more developed and densely populated compared to the outskirts or rural areas. It can be thought of as the "city center" or "downtown" region where most of the commercial, cultural, and administrative activities take place.
While "nội thành" primarily refers to urban areas, it can also imply a sense of community or cultural identity associated with living in the heart of a city.