Casual conversation is a type of informal communication between two or more people. It typically involves topics that are not too serious and can include small talk, gossip, and other lighthearted topics. The term 'casual conversation' can be broken down into two words: CHAT and smalltalk. CHAT is a four-letter word that refers to an informal conversation between two or more people, usually over the internet. Smalltalk is a nine-letter word that refers to a lighthearted conversation between two or more people, often about everyday topics.