An archive, as the name suggests, is what you and your site visitors (potentially) would use to keep track of your myriad blog posts. In WordPress, you have the option of setting up an Archive page, which displays your past posts in easy-to-navigate categories. You can choose to archive posts by month of publication, subject matter, post authors, or practically any other criteria you prefer.
Additionally, you could add an archives widget to your WordPress site’s sidebar or footer. This more streamlined approach lets your readers find past posts, without having to leave the page they are on.