In WordPress, posts are dynamic content entries used for blog articles, news, and updates, displayed in reverse chronological order on your blog’s homepage or posts page. They can receive comments, be categorized, and are included in RSS feeds. Pages, on the other hand, are static and used for content that doesn’t change often, like ‘About Us’ or ‘Contact’ pages. They don’t support categories, tags, or typically comments. The choice between a post and a page depends on the content’s nature and how you want it to be accessed on your site, playing a crucial role in organizing and presenting your site’s content.