Explain the concept of 'VNode' and how to use the 'h' function.

A VNode is a Virtual Node; the h function (hyperscript) is used to create them manually without templates.

VNodes are simple JS objects describing what the DOM should look like. The h() function takes three arguments: the tag/component, props/attributes, and children. This is useful for building highly dynamic components where template logic becomes too cumbersome (e.g., a component that renders <h1> through <h6> based on a prop).