A crypto airdrop is a marketing strategy used by blockchain-based projects to distribute free tokens en masse as part of a promotional initiative. These airdrops involve direct deposits of digital tokens into users' crypto wallets. The aim is to increase awareness about the project or platform and encourage wider adoption of its native token. A variety of airdrop types exist, including standard airdrops that require no tasks aside from signing up, bounty airdrops where users perform promotional activities for rewards, holder airdrops rewarding users holding a certain amount of tokens, hard fork airdrops occurring during protocol splits, exclusive airdrops rewarding user engagement, and raffle airdrops where winners are selected randomly. Companies typically launch public campaigns across various forums and social media platforms to promote the airdrop, compile lists of potential recipients, and facilitate token distribution through smart contracts.