How to create a PDF of a webpage for offline reading on iPhone and iPad

One of the easiest ways to read articles offline is to save them as a PDF, and thanks to a handy feature provided by Apple, it's effortless to do on your iPhone and iPad.
Saving a webpage as a PDF ensures that you'll be able to read an article while offline, but it also is advantageous if you wish to share it or view it on another device.The whole process is surprisingly easy and only requires a single app — Safari.