I watched the Hollywood version of The Ring (2002), but I didn't watch the original Japanese version Ringu (1998). Are the plots of both movies exactly the same? If not, what are the differences between them?
In general Both films are based on Koji Suzuki's novel Ring and focus on a mysterious cursed videotape that contains a seemingly random series of disturbing images. So in most places movies are similar with little change and even the ending part is similar too.
The main difference I got from Wikipedia is that in Ringu, the reason for the curse is in history of the great psychic Shizuko Yamamura, whose astounding supernatural power was accused to be a fraud. Yamamura committed suicide for which and the power passed on to her daughter also made her distrusted by the world and ultimately, killed by her father. And that girl become the ghost.
In The Ring, the story is little different but otherwise the story follows the similar path.
Here is a point to point difference from a viewer point of view.