WordPress comes with posts and pages as two default content types. Posts are displayed in reverse chronological order (latest to oldest) on your blog or homepage.
Pages, on the other hand, are stand-alone content that is not published in a time-specific order. They are typically used for one-off content like your about us or contact page.
Sometimes, you may need to display excerpts for your pages. For example, this can be handy if you have built a WordPress website using only pages.