Web Design is the process of designing how a website will look and function for a user. IT is the process of designing the user interface and the general user experience. It may involve graphic design and photo editing to reflect the company brand.
Web Development is then the process of turning those designs into a working website using a selection of different programming languages and techniques. When we develop a website we like to have it interact with your customers where possible, for example capturing data and posting it to your sales / accounting software or integrating it with other software packages or business processes.