A chat bot is nothing but a mechanism in which humans can interact with a device, which understands the intent of the human and guides them to a desired response. The earliest form of a “chatbot” would have been the IVRS (Interactive Voice Response System) technology that we use on our voice calls. You dial a number, and a recorded voice gives you options, and you select one by punching a number on the phone. And you do this iteratively a few times…and hopefully you get the answer that you are looking for.
