You might be tempted to think an article is the same as a page. Strictly, it isn't. Joomla doesn't think in terms of pages. Joomla figures any web page is constructed of a whole lot of database-driven bits and pieces—and almost any combination of those bits and pieces can turn up on the visitor's browser as a web page.
The steps to converting the psd are not too complicated; however the actual conversion requires a number of fairly specialized skills with regards to graphic design, HTML programming skills as well as CSS skills. There may also be some scripting involved too, which makes the process quite labor intensive as far as programming skills are concerned. The steps to converting a psd to Joomla are briefly: