An airdrop is an unsolicited distribution of a token or coin, usually for free, to numerous wallet addresses. Airdrops are often associated with the launch of a new cryptocurrency or a protocol, primarily as a way of gaining attention and new followers, resulting in a larger user base and a wider disbursement of coins. Airdrops have been a more important part of ICOs since crypto have started doing private sales instead of public offerings to raise initial capital.
