Posts are what make your site as bloging site
Posts are entries listed in reverse chronological order on the blog home page or on the posts page if you have set one in Settings → Reading. If you have created any sticky posts, those will appear before the other posts. Posts can be found in the Archives, Categories, Recent Posts, and other widgets. Posts are also displayed in the RSS feed of the blog. You can control how many posts are displayed at a time in the Reading Settings. The URL for a post includes the date the post was published like this:
Posts are also known as articles and sometimes referred as blogs or blog posts. These are used to popularize your blogs.