FalsinSoft

GPIO mean "General Purpose Input/Output" and is a special pin present in some chip that can be set as input or output and used to move a signal high or low (in output mode) or to get the signal current status (in input mode). Usually these pin are directly managed by kernel modules but there are an easy way to manage these pins also from user space.

Webmaster, web developers or, in general, developer of each sector could need a way for inform the user that a specific operation is in progress. Usually this kind of info is showed through some animation that makes you feel regarding the current application working. The animation on the left is a common example about. If you don't want to spend a lot of time to make your own animation there is an online service who can give you some ready made animations.