O que é airdrop?

The two airdrops sent by Binance at night, one is 1000cat, and the other is pengu, two big pieces of meat, Binance is really generous. I have a great connection with Simon's cat and received two rounds of airdrops, the price is very strong, and I am earning living expenses effortlessly.
$PENGU $1000CAT $BNB #PENGU开盘 #币安Alpha #USUAL现货开盘预测 #加密用户突破1800万 #比特币冲向11万？