The ability of machines to think intelligently like a human is known as artificial intelligence (AI). AI advancements have enabled machines to mimic natural intelligence and make decisions like a human. AI and Human-Computer Interaction (HCI) paradigms are used to design and construct intelligent conversational chatbots. The Chatbot is defined as a computer program that would be intended to emulate dialogue among humans, particularly over the web. In this article, the PRISMA Model is used to provide significant scientific articles published from 1950 to 2022 on Intelligent Conversational Chatbot evolution, techniques, and classification. The objective of the article is to describe the current intelligent conversational chatbot approaches that were in use and represent their comparison based on techniques, drawbacks, and applications. Chatbots have the potential to enhance human-machine interaction.