An utterance is a single, complete piece of speech or text in a conversation. It's anything that someone says or types during an interaction with a chatbot or conversational AI.
Each time a user sends a message to a chatbot, that message is considered an utterance. Similarly, the chatbot's responses back to the user are also utterances.
Utterances can be as simple as a single word, or as complex as a long, multi-sentence statement. They represent the basic building blocks of a conversation.