What are cryptocurrency airdrops?

Cryptocurrency airdrop is a popular tactic in the crypto industry, which involves the free distribution of tokens and crypto to promote new projects. To receive a reward, the user just needs to follow a few simple steps, for example, download the application, subscribe to the project page on social networks, become the holder of some crypto asset, or repost some post on their page. Airdrops became very popular in 2017 during the active development of ICO and are in demand at the moment.