
Edward M. answered 11/25/19
Bachelor of Arts in Graphic Design with over 20 years experience
HTML and CSS are markup and stylesheet languages, respectively, while Dreamweaver is considered an IDE (integrated development environment) or editor. Dreamweaver is software, and HTML/CSS are languages. HTML is the basic core skeleton of the webpage and CSS can be thought of as the "interior designer" of that skeletal framework. Dreamweaver, as an integrated development environment, includes a CSS editor and an HTML editor (known collectively as "code view"). Dreamweaver is considered a WYSIWYG (What you see is what you get) editor, where the changes in the code are reflected visually and rendered in real-time in the preview window on the right hand column of the editor. The preview window is a crude representation of what the code will look like when it is rendered by a browser.
Hope that clears things up a bit. Best of luck in your coding endeavors!