The main difference between posts and pages is that posts are dynamic and can be used in multiple ways, while pages are static and remain in one place until changed. [more]

Here are some other differences between posts and pages:

Content

Posts are for dynamic content, like blog posts, news articles, and recipes. Pages are for static content, like a contact page or home page.

Purpose

Posts are for sharing regular content with your audience. Pages are for publishing important information.

Interactivity

Posts have comments enabled by default. Pages can have interactive content like contact forms, polls, and surveys.

Attribution

Posts usually have author attribution and a date of publication, while pages do not.

When deciding whether to use a post or a page, you can consider what you want your audience to see. If the content is timeless and integral to your site, it should be a page. If the content is timely and not foundational to your site, it should be a post.

For more detail, you can read this article.