To exchange information between a user and the computer user interfaces are employed. User interfaces are a way of communicating with the computer and getting the required result from it. Earlier UI's appertained to either of the types that are command line, menu-driven, and graphical UI's. But, as technology has advanced, we have other categories of UI that have evolved, which are Voice assistants and conversational UI's (ChatBots). With the advent of conversational UI's more and more companies are focusing on replacing their current menu-driven UI's with these.

Conversational UI makes it easier for human and computer interaction. CUI's let the user express them in the most natural way possible. The use of artificial intelligence and natural language processing in conversational UI increases its efficiency to interact with humans and provide the service for which they are designed. Mainly they are used in ChatBots to help users find something or answer their questions. In the era when the conversational UI's were not developed, user's questions were asked through queries, by identifying the keywords and mapping them on to the related queries.

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