Site Map:
A site map (or sitemap) is a web page that lists the pages on a web site, typically organized in hierarchical fashion. This helps visitors, and search engine bots, to find pages on the site. A site map can be done before the site is even designed to help the designer visualize what he needs to design. Think of a site map as a visual diagram.
HTML Tables:
In HTML, tables are created with the table tag. Each table consists of a number of rows, specified by tr (table row) tags. Each row consists of cells, specified by td (table data) or th (table header) tags. Nowhere is the number of columns specified; that's determined by the number of cells in the rows. Tables and Cells allow you to designate areas within your webpage for text and images, rather than flowing from top to bottom.
Cascading Style Sheets:
In computing, Cascading Style Sheets (CSS) is a stylesheet language used to describe the presentation of a document written in a markup language. Its most common application is to style web pages written in HTML and XHTML, but the language can be applied to any kind of document, including SVG (Scalable Vector Graphics) and XUL (pronounced zool )the XML User Interface Language