The process of planning, creation and updating of websites. It also involves information architecture, website structure, user interface, navigation ergonomics, website layout, colors, contrasts, fonts and imagery as well as icon design.
All web browsers render websites differently.
There’s a big difference between responsive and mobile web design. Mobile design is restrictive. It serves up a separate, and often limited, version of your website that can be used on smartphones and tablets. Responsive design is extremely flexible, allowing websites to resize and reflow their layout based on the visitor’s screen size.