I'm sure there are lots. The one that comes to mind now is Dropbox. It solved this problem: https://xkcd.com/949/ https://xkcd.com/949/ The interesting thing

I'm sure there are lots. The one that comes to mind now is Dropbox. It solved this problem: https://xkcd.com/949/ https://xkcd.com/949/ The interesting thing about it is that it's one of those problems that people wouldn't really recognise as a problem until a new solution was presented. Before Dropbox if you came to HN and complained about file transfer, or suggested that you wanted to make something like Dropbox the average response would be "we have FTP and there's nothing wrong with it duh ..".