In your opinion, what is metadata and how does it affect the understanding and use of data?

In your opinion, what is metadata and how does it affect the understanding and use of data? Provide an example of how metadata affects the data that you use every day.

According to you, what is data and what is information? Compare data and information.

How do e-commerce websites use database technologies to improve sales and track customer-buying and customer-searching habits? In your discussion, provide at least three examples of e-commerce websites that use databases.  Among the three examples you selected, which database design do you find most impressive? Why?