Reading Lists is Apple's own take on a read-it-later service. Built right into the Safari browser, you can save any webpage you find interesting but just don't happen to have time for at the moment. Then, you can come back when you're ready, and find all your saved items, all in one convenient place. Because Reading Lists sync, you can also save things from your iPhone on the go, then read them at home later on your iPad, or stack up a bunch of articles from your Mac, then read them while you're waiting in line on your iPhone. It's not as powerful as some App Store alternatives, but it's built right in, and that makes it incredibly convenient.
That's it. The page or story is now in your Safari Reading List. Keep in mind that the process you'll use may vary a little in third party apps that support Safari Reading List. If all else fails, just look for a Share button or hold down on a link to see if an option comes up.
That's all there is to it! Many apps support Safari Reading List now so you can pretty much send articles and web pages to it from wherever. This makes it perfect for recipes, funny articles you want to remember to share later, and pretty much anything else you don't want to have to try and remember where you found it later.