Let say that you want to have or  create a splash screen page on your Joomla, Mambo, Drupal, Wordpress where users can choose what what language their prefer, or you just want to put an a huge image to greet your visitors. And suddently you're wondering "How on earth I'm supposed to do that kind of thing?".

Hotlinking equals to bandwidth stealing, if some one post the images on your server on their site they not only putting the images without permission, but they also steal and consume your bandwidth.