Web development is the work involved in developing a website for the Internet or an intranet. Web development can range from developing a simple single static page of plain text to complex web applications, electronic businesses, and social network services.
whose activity consists in projecting visual communications intended to transmit specific messages to social groups, with specific objectives. Design is based on the principle of "form follows a specific function"
SEO stands for search engine optimization. PPC stands for pay per click. Though their end goal is the same, they are different concepts that require different techniques and methodologies.