For those that don't know Pocket, it is a service that let's
you save articles from any website, blog, and so on, and read them
whenever you want on your favourite device, providing also an
improved formatting for mobile devices. Wikipedia explains all of this nicely.
As an example, I usually save articles from my phone when I don't have the time to read them (or when I want to keep them for future reference), and read the later on my Kobo ereader, that has this application embedded.