Conversational UI, or User Interface, pertains to the design and structure of interfaces that facilitate conversations between users and computer systems. The primary objective of Conversational UI is to create intuitive and engaging interfaces that emulate human conversations, enabling natural and seamless interactions.

Conversational UI designs leverage natural language, speech recognition, and AI capabilities to craft interfaces that users can communicate with using everyday language. It's about making the interaction as close to a human-to-human conversation as possible, enhancing user engagement and understanding.

When designing a Conversational UI, considerations include the use of appropriate language, understanding user intent, providing clear options or responses, maintaining context, and ensuring a conversational flow that feels natural. Visual elements, if present, should complement and enhance the conversation without overwhelming the user.

Conversational UI is utilized in various applications and platforms, including chatbots, voice assistants, messaging apps, and customer service portals. It finds applications in customer support, e-commerce, healthcare, finance, and many other domains, aiming to enhance user experience and simplify interactions.

Understanding Conversational UI is crucial for UX designers, product developers, and anyone involved in creating interactive interfaces. A well-designed Conversational UI can significantly impact user satisfaction, engagement, and the overall success of the application or platform.