We refer to a concept as a Web site design, which shows exactly how the site will look, but not necessarily including the correct text or functionality.
CMS (Content Management System)
This is a computer software system for organising creation and publication of Web pages, documents and other content.
These are programmes created by search engines that trawl or ‘crawl’ round the Internet collecting information about the Web sites. (Crawlers are also known as spiders.)
CSS Cascading Style Sheet
A CSS is used in conjunction with HTML to provide formatting information to the Web page.