The two main parts of a template are the content management code and the theme. These should be kept separate so that the theme can easily be changed without affecting the structure. For example, the styles should be defined in an external style sheet and not embedded in the HTML code of the pages. The structure of a website will be defined by a set of templates. It is good practise to make the templates modular rather than having page templates containing all the code for each page. This allows site-wide changes to be easily applied. For example, the footer may be mostly identical between pages.
So, more and more sites are operating on Joomla nowadays. Joomla Templates are easy to use and they give you a chance to manage the content of your web site without going into details of the source code. A user friendly admin panel enables anyone to edit texts, pictures, product images, etc. If you wish to have Joomla like a splendid foundation for your online project, you can choose any example of Joomla Templates offered by Template Monster.