Your filesystem lets you keep everything in one place: on a hard disk. Text, documents, images, movies, sounds, web pages and bookmarks can all be stored in your filesystem for safe keeping - ready for opening whenever you want to! They can be found again quickly by using grep, slocate, find, Windows Find, the Mac's Spotlight or QuickSilver, or any number of other hard drive searching utilities. You can store things in folders, sub-folders, sub-sub-folders, and create links between those folders, add metadata and shunt files around to your heart's content. It even has powerful encryption utilities like OS X's AES encryption or the open source GPG encryption utility to help you avoid suffering partyvan humiliation when the FBI find ur child porn stash! You can sync files on your file system using free file sync tools like rsync, scp, (s)ftp and so on. You can even get OMG CLOUDremote access to your file system and to many of the utilities by enabling SSH and not being a complete moron. If you want to do something even mildly clever with your file system, you'll find that popular programming langauges like C, Java, Python, Ruby, PHP, Lua, Smalltalk, Objective C, ActionScript, bash and many more will enable you to manipulate files on your computer with great ease. Files stored on your file system can be in any number of different formats, and you have the complete freedom to choose what formats they are! Knowledge of how file systems work is widespread, and tools to manipulate files on a disk have been around for decades.