From the website: Gutenberg https://wordpress.org/plugins/gutenberg/Description
“The goal of the block editor is to make adding rich content to WordPress simple and enjoyable.
“Warning: This is beta software, do not run on production sites!
“The new post and page building experience will make writing rich posts effortless, making it easy to do what today might take shortcodes, custom HTML, or “mystery meat” embed discovery.
“WordPress already supports a large amount of “blocks”, but doesn’t surface them very well, nor does it give them much in the way of layout options. By embracing the blocky nature of rich post content, we will surface the blocks that already exist, as well as provide more advanced layout options for each of them. This will allow you to easily compose beautiful posts like this example.
“Gutenberg is built by many contributors and volunteers. You can see the full list of contributors in the GitHub CONTRIBUTORS.md file which we are continuously updating. You can follow along on github.com/WordPress/gutenberg and on the #editor tag on the make.wordpress.org blog.”