Airdrops are promotional events in the cryptocurrency space where coins or tokens are distributed for free to participants' wallets. The purpose of airdrops is to promote awareness, reward loyal users, or incentivize participation in a blockchain project. Typically, recipients need to meet specific criteria, such as holding a certain token, signing up for a newsletter, or completing promotional tasks. The concept emerged alongside the rise of cryptocurrencies, particularly with the growth of Initial Coin Offerings (ICOs) in the late 2010s.