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Technology advancements are constantly focused at enhancing the quality of life for its consumers. A similar observation may be made about natural language processing. In recent years, chatbots, or conversational systems, have grown in popularity due to their ability to converse with humans. Chatbots may be used in a range of businesses and applications. This article will do an in-depth study of the most current chatbot systems/papers in a variety of topics. As a result, these current publications have been examined to acquire a better knowledge of how chatbot systems are presently being built and how they are being utilized in a variety of situations, including the workplace.