Static site generators takes some definitions of a site and renders it into a static site that doesn't have any dynamic parts, i.e it is not dependent of a ASP.NET, node etc back ends. It could be run just out of basically any storage.
A common scenario for this is a blog. You add posts in, for instance, a GitHub-repo, and then run the generator to add links etc to the newly created page.
You usually crate new pages/blog posts using Markdown, a simplified mark up language to describe text layout (I'll probably do a post about that).
There's a great site listing all kinds of different static site generators.
Why don't you try out a site generator in your next project?