"Web development refers to building, creating, and an maintaining websites. It includes aspects such as web design, web publishing, web programming, and database management.
While the terms "web developer" and "web designer" are often used synonymously, they do not mean the same thing. Technically, a web designer only designs website interfaces using HTML and CSS. A web developer may be involved in designing a website, but may also write web scripts in languages such as PHP and ASP. Additionally, a web developer may help maintain and update a database used by a dynamic website."
From Tech Terms