This is the 1730th most frequent Chinese word.
外面
Outside; exterior.
In this sentence, 外面 is used to denote the spatial area beyond the current location, like outside the room or house.
什么声音?外面是不是有人?
What is that sound? Is there someone outside?
The term 外面 (outside) indicates the physical external environment where activities occur.
外面有很多活动可以参加。
There are many activities outside that one can participate in.
Here, 外面 refers to the external part of the dwelling or house, specifically the balcony, relative to the indoors.