Conversational AI considered as sub-domain of  Artificial Intelligence that deals with speech-based or text based AI agents to have interactions. Conversational AI  Agents like chatbots and voice assistants are some helping  tools which can perform this type of functionality. For  Conversational AI, Machine Learning and Deep Learning  are playing an important role. It has been a huge amount  of advancement due to the increasing research interest in these fields. Complex hardware structures like GPUs and  TPUs new advancement needs to be in existence. As NLP  and its components are widely enhanced these type of  chatbots are mostly used in healthcare, education systems,  banking sector and ecommerce. Due to these fields  today, Conversational AI is in high demand and is more  preferable by organizations. More newer architectures  can be seen in future having complex core components.