In 2018, the WordPress text editor is evolving in depth. The text editor you know well, named TinyMCE, is replaced by a new concept called Gutenberg on all sites using the WordPress software.
This new editor is presented as making it easier to publish content on WordPress, and focuses on simplifying complex layouts and adding external and multimedia content.
Thus, Gutenberg works as a system entirely made up of “blocks”, which refer to each element (title, paragraph, multimedia element, etc.) that can be inserted in a post or page. These blocks have been introduced in order to facilitate the insertion and modification of elements in the content, compared to the traditional editor (TinyMCE), by integrating functions into the block system that were previously only accessible via shortcodes or html code (embed, for example).