By default, WordPress comes with the Gutenberg Block editor. There are also lots of page editors, including Elementor and Beaver Builder, which offer a WYSIWYG (what you see is what you get) front-end editing experience (more like Squarespace or Wix).
Kadence is a hybrid between the default Gutenberg editor and a front-end page builder. It allows you to create pages and posts on Gutenberg, but creates containers around your blocks that allow for a lot more options and flexibility.