The editor is where you actually write and format content in WordPress. When you click “Add New Post” or open an existing page, this is the screen you land on.
Since WordPress 5.0, the default editor is the block editor, also known as Gutenberg. It lets you build content out of individual blocks — paragraphs, images, headings, columns — instead of one continuous text field.
Block Editor vs Classic Editor
Before blocks, WordPress used what’s now called the Classic Editor — a single text box similar to a word processor. Some site owners still prefer it and keep it running through a dedicated plugin, especially on older sites with lots of existing content.
Also: The Site Editor
Beyond the content editor, modern block themes also include a Site Editor, which lets you visually edit templates like your header, footer, and overall layout — not just individual posts and pages.
Between the content editor and the site editor, most WordPress customization today can happen without writing any code at all.