Answer:
What Is a Sidebar? A sidebar is a block of supplemental text that appears next to a main article in a magazine, newspaper, or website. It relates to, expands, and adds value to the article it accompanies
First, a sidebar can be used to encourage the reader to read the more detailed main article. For example, a sidebar can be made that lists the major points of the main article or asks questions about information that will be given in the main article as a way to entice readers to read the entire main article.