Web Pages - permanent webste pages such as home, about, mission, team, bios, services, projects. They may get updated as the business changes over time.
Articles - articles are special pages, individual articles, that are commonly accessed via an articles page/section. Some you place an articles or latest neews link on the home page or in a column and it will lead to the specific article, and to the articles section.
Blog - your blog or weblog is a special section where you can post content on topics of your choice with the option for visitors to post comments.