More about blocks
Using a system of Blocks to compose and format content, the new block-based editor is designed to create rich, flexible layouts for websites.
Content is created in the unit of blocks instead of freeform text with inserted media, embeds and Shortcodes.
Blocks treat Paragraphs, Headings, Media, Embeds all as components that strung together make up the content stored in the WordPress database.
The new editor is designed with progressive enhancement, meaning it is back-compatible with all legacy content.
Blocks offer enhanced editing and format controls, but importantly can reveal to content creators new ways to make an impact.