Posts and pages contain the actual content of your website. While they appear similar and work inside WordPress in a much similar fashion, they serve different purposes in WordPress’s structure.
Posts
Posts are used to create articles, blog content, or other types of content listed in your post content area, and are showing in reverse chronological order (from newest to oldest) by default. This means posts have a time component to them. They can also be organized with categories and tags and can be archived. Posts are meant to be dynamic.
Pages
Pages are used to create static content, like contact, about, legal or policy pages. They’re organized hierarchically by parent and child pages as opposed to categories.