Web Development & Web Design are two sides of the same coin. We must consider factors like design, user experience, and accessibility in web development. The difference is that one is more concerned with visual aesthetics that the user perceives, and the other is more focused on technical factors regarding the content and programming of a website. If you want to create an online store, you will concentrate your efforts on web design; but if you want to develop a social network site, then Web Development would most likely be your primary interest.