Layout design is the process of producing a graphical representation of your website. It is usually comprised of a mock up of one or two homepages which will then be used to develop the interior pages. We generally provide 3 revisions of the design, and then pursue the development of the site the client is happy with.
Design conversion refers to converting the layout design into a functioning website. Most websites are built using HTML for further content structure, CSS for further layout styles and Javascript for eye candy and user interaction.