As a web design instructor, your job is to teach classes on the schedule you or your school sets for the program. You create the lessons, explain how different computers can affect code, and evaluate the work submitted by your students. As a web designer, you are responsible for big-picture decisions, like the menus listed on the site, and smaller details, like which fonts, colors, and graphics to use. A web designer creates the layout and design of a website. In simple terms, a website designer makes a site look good.