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Artificial Intelligence is the ability to make machines intelligent. The development in AI made machines capable to initiate the simulation of natural intelligence and are able to take decisions where humans do better. Natural Language Processing, Machine Learning are some of the major branches of AI. A Chatbot is an AI software uses Natural Language Processing Techniques to simulate a chat between a system and a user. Natural Language Processing help Chatbots to understand natural language more clearly and generate an intelligent response. Since the introduction of first Chatbot ELIZA in 1966, different versions with variety of technology and approach have been developed. In this paper, we describe the generic work flow of Chatbots and represents their comparison on the basis of technology/approach used with some significant parameters. To make natural language conversation more efficient, a Chatbot must analyze and understand the user input correctly for a relevant response. They are currently being used in various important domains like science, education, health care etc. Chatbots have a potential to improve human interaction with machines.
Singh et al. (Mon,) studied this question.