What does a subheading tell you?

A subheading is text placed under a headline, often with a smaller font, which expands on what the headline says. For example, a headline could announce the launch of a new product and a subheading could give more specific details about the product's features.

What is subheading used for?

Subheadings are usually reserved for shorter sections within a larger section. So if your paper has three main points, but the first point has three main subpoints, you might use subheadings for the subpoints under main point 1. 1. Headings should correlate to the preview of the paper.