To make the concept or the technology clearer, it is a good idea to discuss the Google Docs analogy. Google Docs analogy for Blockchain After the advent of the eMail, the conventional way of sharing documents is to send a Microsoft Word doc as attachment to a recipient or recipients.
The recipients will take their sweet time to go through it, before they send back the revised copy. In this approach, one needs to wait till receiving the return copy to see the changes made to the document. This happens because the sender is locked out from making corrections till the recipient is done with the editing and sends the document back.