A subheading's purpose is to:
Grab the readers' attention so they will stop to read before continuing to scan until the next subhead, which they will then read and evaluate similarly. Guide the reader down the page as they scan from one subhead to the next.
What is the purpose of the subheading?
Sub-headings are often seen in non-fiction writing, such as an instruction text or an informational text. They capture the reader's attention to keep them reading down the page, following each sub-heading.
Why do we use headings and subheadings?
Headings and subheadings represent the key concepts and supporting ideas in the paper. They visually convey levels of importance. Differences in text format guide readers to distinguish the main points from the rest.
