An airdrop is a term for a large-scale distribution of free cryptocurrency tokens into a digital community. It can provide a number of benefits to the creators of a cryptocurrency, including promotion and increasing the price of the token. Some argue it's also a way of getting around the SEC's ruling that ICOs are securities; if digital assets are given away for free, they can't technically be considered securities. But the token still gets propagated, leading to large numbers of people adopting it for trade. Airdrops can also come in the form of forks.