Conversational user interface (UI) is changing the way that we interact. Intelligent assistants, chatbots, and voice-enabled devices, such as Amazon Alexa and Google Home, offer a new, natural, and intuitive human-machine interaction and open up a whole new world for us as humans. Chatbots and voicebots ease, speed up, and improve daily tasks. They increase our efficiency and, compared to humans, they are also very cost-effective for the businesses employing them.

This chapter will address the concept of conversational UIs by initially exploring what they are, how they evolved, what they offer, their challenges, and how they will develop in the future. The chapter provides an introduction to the conversational world. We will take a look at how UI has developed over the years and the difference between voice control, chatbots, virtual assistants and conversational solutions.