6 WHY do people make small talk?

by Jillian Zavitz

It serves many functions in helping to make a situation lighter especially when the atmosphere becomes too formal. It helps out break uncomfortable silence between new acquaintances. It also serves to kill time, especially when your hands are tied to engage in something—like I’ve mentioned waiting.  I think small talk is basically to break the ice—break the silence and the monotony of a boring atmosphere.

Source: http://www.englishclub.com/speaking/small-talk_wh.htm