XML generation. How can XSD help?

Question

XSD

I welcome everyone. There is a certain set of data, you need to generate xml files from it. Previously, if you had to write something in xml , then you wrote nodes and so on directly in lines to the file (because those were some little things). So, according to the data set, there is xsd . Never encountered this before. The question is, how can xsd make it easier to write to the actual file? Or is it for other purposes?
If so, please provide links to examples.