where is all deleted data will go from memory system/internet? where is all deleted data will go  from a memory system ? 
if it is not deleting actually where it storing ? 
i am always wonder about this when we are sending something to a memory system it takes long time (depends up on usb port) and when we are deleting it not taking more than a bling of eyes and disappears actually where it goes ? 
** deletion process is happening on both memory device and internet is same or different ** ? can we recover data from internet ?
Deleting is not necessarily destroying data. It can be done (much faster, indeed) by making it inaccessible. You can do it by erasing critical information from the data structures that are used to index the data you want to delete. How exactly this is done depends on how the storage device is organized (formatted).