Two most common objects in VB databases (ADO recordset and ADO connection)

I have been upgrading my class for more than ten days. During the summer vacation, our main task is to study English and database. First, I learned how to parse this book for a classic instance of VB Database Development. I knocked out instances 1 to 5 and thought about them carefully, the two most impressive things are ado recordset and ADO connection. Even though I remember them, I didn't know what they actually did. I only knew what they did when I opened the book and looked at it again, there are two objects. Baidu searched them for their specific attributes and methods, and summarized them with a mind map. This time it was a little cheerful, but it was not very clear yet. Below is a general mind map,

 

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