expression, noun
city at night; town at night; nighttime streets
Refers to the general atmosphere or scenery of a city or town after dark, without necessarily implying nightlife.
夜の街を一人で歩くのは少し怖い。
Walking alone through the city at night is a little scary.
窓から夜の街の灯りが見える。
From the window, you can see the lights of the town at night.
expression, noun
nightlife district; drinking district; entertainment area
Specifically refers to areas with bars, clubs, and nightlife; often carries a slightly seedy or adult-oriented connotation.
彼は毎晩、夜の街に繰り出している。
He goes out to the nightlife district every night.
この辺りは有名な夜の街だ。
This area is a well-known drinking district.
Compound of 夜 (night) + の (possessive particle) + 街/町 (town/city). The phrase literally means 'town of night' and is used both literally and to refer to nightlife districts.