The idea is to produce a PDF that makes the article more readable than if you relied on the default print output of the site itself. In somes cases, e.g. a sit

The idea is to produce a PDF that makes the article more readable than if you relied on the default print output of the site itself. In somes cases, e.g. a site that's gone to the trouble of creating a good print stylesheet, printing from the site itself will probably create a more readable output than this. But many sites don't do that. There's also the use case of automating PDF creation from code. For example, automatically sending a PDF to your printer (some wireless printers can now be set up with email addresses) of articles you save to read later in a read-later service.