In the world of cryptocurrencies, the term "dust" refers to a minute amount of coins or tokens, so small that it is often neglected. For example, in the case of Bitcoin, the smallest unit of currency is 1 satoshi (0.00000001 BTC), and a couple hundred satoshis could be called dust.
In other words, dust represents such a small transaction or amount that sending it is not profitable due to the high transaction fee. On cryptocurrency exchanges, dust refers to a small number of coins that are “stuck” and cannot be traded.
Most users do not pay attention to the dust in their wallets and rarely think about its origin. Until recently, this was quite normal, but with the advent of dust attacks, this approach is no longer so safe.