Each content in the WordPress Block Editor is a block. They are the building blocks of your post or page.
The WordPress Block Editor offers an array of blocks that can be used to create media-rich pages and posts. You can control the layout of the blocks with ease, to build visually appealing web pages.
You can add blocks for paragraphs, images, headings, lists, videos, galleries, and more. WordPress has blocks for all common content elements, and more can be added by WordPress plugins.
The anatomy of a block
Each block consists of a Block Toolbar, a Block Settings Sidebar, and the Block Content.