density = number of units per square meter high density = lots of units per square meter low density = few units per square meter These words can be used for just about anything.

Pretty much the opposite of high-density housing. :P In Shanghai, for example, there are certain areas in which the population density level is on average around 2657 people per sq km. The houses within such areas are in close proximity to each other with little room for green areas such as gardens, this is high-density housing. Using another extreme example, in Mongolia the population density is 1.7 people per sq km. This is highly unusual considering it's the 19th largest country in the world. Due to the low population density, housing would tend to be spread further apart with more room for green areas (although this may be different in Mongolia, given the enormous area of the Gobi and former Soviet rule). Such a sparsely populated country is ideal for low density housing.

In the US it refers to housing or housing complexes that have a low population density. It depends on where you live. In New York, low density can refer to Apartments that are spacious. In a suburb of Chicago it could be family homes or condos with large lots and yards and a smaller population.

"Low-density housing" refers to housing in which people are more spread out. There are not as many people in a given unit of area. High-rise apartments are high-density housing. Separate houses with one or two families each would be considered low-density. (If I thought I was wasting my time, I wouldn't answer in the first place - hope this helps)