Web Design
It is very easy to make a web page, but it is very hard indeed to make a good web page. A basic web page only needs a few lines of Hypertext Mark-up Language (HTML) plus whatever content you want to add. Then you add what are called tags to different types of content. For example, paragraphs are enclosed in paragraph tags (<p>Some content for a paragraph.</p>). There are also tags for different types of lists, different levels of headings and for things like block-quotes and images.
In the early days of the World Wide Web this was all that was required for web pages when most of the people connected to the Web were students and academics in universities. There were so few web pages available on a limited number of subjects that what pages looked like was not so important as long as the content was relevant and interesting.
Things have changed a great deal now of course, and as well as web sites needing to have good content, they need to look good as well. HTML was too limiting for the purpose so a system of styling web pages was developed called Cascading Style Sheets (CSS). If the content was marked up properly with HTML then how the content looked could be controlled by the CSS.
This development led to the creation of a new profession of Web Design. Designing web pages was clearly beyond the scope or proficiency of content writers, whose expertise, after all, lay in the subject they were writing about, so the new Web Designer was brought in to design the web page.