A data about data; it provides the information about data generator. It helps to understand the information that has been stored in a particular Data Warehouse. Meta Description and Meta Keywords provides detailed information about webpage|blog. Below is the example: a article may include metadata that provides a complete information about that particular article.
Do I require to keep Metadata?
Yes, it will help you to find your required data from the Data Warehouse. It'll reduce your search time, easy to understand and very important you can store it in a particular format.
