![Hands-On Chatbots and Conversational UI Development](https://wfqqreader-1252317822.image.myqcloud.com/cover/342/36700342/b_36700342.jpg)
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Blocks
Go back to the editor and look at the Bot Structure tab. Under Bot Structure, you will find two types of blocks—built-in and user-defined. Welcome message and Default answer are the two built-in blocks. We will be building user-defined blocks to implement the conversation capability of the chatbot. Each block can be thought of as a response segment of the chatbot. Each block can contain one or more cards.