Dust is a small quantity of cryptocurrency left over after a transaction or trade has been done. This is typically worth less than one cent. Dust transaction refers to the reality that the amount of ‘dust’ is too small to be sold or exchanged because the amount of dust cannot cover the transaction fees. Thus, dust accumulates in the wallets of various users and people usually ignore specks of dust. However, dust can be used in dusting attacks, where users' anonymity can be tracked by dust activity in the wallet. It is not all bad as some organizations like Dust Aid sweeps up dust in users' wallets to give them away for charity purposes.