What is airdrop?

Two airdrops from Binance at night, one is 1000 cat, the other is pengu, two big pieces of meat, Binance really is powerful. I really have a connection with Simon's cat, got two rounds of airdrops, and the price is very strong, making a profit for living expenses.
$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？