What is the origin of the idiom "small talk" and when to use it?

The idiom "small talk" refers to casual and light conversation, typically about unimportant or trivial topics. It originates from the idea of engaging in chit-chat or informal discussions that do not delve into significant or substantial matters. Small talk serves as a way to establish rapport, break the ice, or maintain social interaction without delving into deeper, more serious subjects.