Airdrop is one of the ways to distribute tokens to fulfill the requirement of decentralization in the blockchain platform. The essence of the process is that there is a free distribution of coins to users for performing certain actions (registration on the site, in the telegram channel, repost in social networks, etc.).
Airdrop can be carried out not at the start of the project, but among coin holders, for example, in some percentage of the amount available in the user’s wallet. The number of airdrop tokens is limited.