Rings is the bridge between The Ring and The Ring 2. In the six months between the 2 films the copy of the infamous videotape made by Rachel has multiplied many times (still no explanation as to how people know they're going to die) and it's become such an urban legend that there is a website devoted to it.
Jake, the unfortunate high school kid at the start of The Ring 2, has watched the videotape in order to save the life of one of his so-called friends, thus taking on board the responsibility of making someone else watch it in 7 days or die by Samara's fright.
Initially Jake is intrigued and is offered a glimpse into the bizarre world of post-videotape viewing that we only saw thru Rachel's eyes in the first. Nothing is explained in any greater detail but the paranormal universe Jake falls into is fleshed-out more and is highly spooky. The short even manages to outdo The Ring 2 by giving us a couple of frights. I don't care how ridiculous the movies are, the image of Samara climbing out the well will ALWAYS be spooky.
Anyone who has seen The Ring 2 will already know what becomes of Jake and his would-be girlfriend Emily (the one he forces to watch the tape) but if you're a fan of the films then this is essential viewing. If you've yet to see The Ring 2 then it's the perfect introduction.