An interface that lets you control a system by talking in normal language.
A conversational interface is like a hotel front desk. You skip the weird menu maze and just ask, “Where’s the pool?”
You meet it in support chats, AI helpers, and search. You learn fewer buttons, but the system must understand you.
Chatbot
A conversational interface is the usual shell for a chatbot.
Prompt
What the user says in chat can become the model’s prompt.
NLU
It needs NLU to understand the user’s goal.
Command Line Interface
It lowers the Command Line Interface hurdle by using normal talk.