Double-Spending is the act of sending the same transaction twice, and was a major flaw of digital assets before Bitcoin. Digital information can easily be duplicated, which is where the need for Double-spend prevention was necessary. It is easy to copy/paste data, or send the same .jpeg image you have on your hard drive to multiple people via email. Bitcoin’s decentralized ledger removes this ability to do the same with Bitcoin spend, and therefore allows for safe and secure digital transactions.