What is Airdrop
An "airdrop" refers to a way of delivering free cryptocurrencies to the public as a form of a marketing campaign to enhance awareness about a specific crypto project.
Early-stage crypto projects require airdrop participants to complete a set of marketing tasks such as joining their discord or following their Twitter account. In exchange, participants who meet the requirements, follow the instructions, and get selected receive free tokens from the project developers.
For more info, read: what is an AirDrop?