What exactly does it mean to be smart when recruiting people?

It is difficult to judge a person's intelligence by his appearance. There are actually two kinds of cleverness, one is called little cleverness, the other is called great cleverness, which can also be said to be great wisdom. Smart people are easy to judge, because they are a little sharp-edged, quick-witted, adaptable, rich in ideas, strong in reception, quick in use and strong in communication.