Xsd extension is associated with XML Schema Definition. You may need xml to define the data.
Xsd extension stands for definition file. Xsd files define how to explain the datas which found in xml files. To define the datas, you will need xml files with xsd. You are not able to use these kind of files by itself. To get detailed information,please check the following links.
What to use XSD
which page related to XSD file
XSD Related Searches
You can check related links about XSD fileextension.