The WordPress editor is the screen where you actually write and arrange your content inside WordPress. The current version, often called Gutenberg, works with blocks: each paragraph, heading, image or button is its own block that you can drag, reorder and restyle. You build a page by stacking these blocks, a bit like assembling a layout from labelled tiles.
It works much like a word processor that knows about the web. You type, you see roughly how it will look, and you do not have to touch the code underneath. That makes it a WYSIWYG tool, short for what you see is what you get, and it is one of the reasons WordPress is friendly to people who are not developers.
For most pages the block editor is enough. When a site needs heavier visual control, some teams add a page builder on top, though that trades simplicity for more design freedom and a slightly slower site if it is not handled carefully.
One feature worth knowing is reusable blocks, now called patterns. You can save a section, say a call-to-action with a heading, a line of text and a button, then drop the same block onto any page and edit it in one place. That keeps a site consistent when several people are writing. A common beginner trap is fighting the editor with too many one-off styles per block. Setting sensible defaults in the theme first means writers stay inside the design instead of accidentally breaking it.
At TopDevs we set up the editor and reusable blocks so your team can update pages confidently, without breaking the design or calling us for every small text change.