There are two ways to drop a candy:
One means that when a chain branches, a new fork will be air-dropped at a ratio of 1:1. For example, BCH is generated after BTC fork, and BCH has a ratio of 1:1 BTC for all BTCs.
The other is that some project issuers make some rules and proportions. At some point in time (the time point of the snapshot refers to the height of a block or a certain point in time), snapshots of some potential users' accounts are recorded. A certain amount of tokens held by the user (such as EOS), and then a free distribution of new project tokens.
Example TOOK snapshot time 2018.21.29, airdrop time 2018.12.3, ratio 1EOS: 0.5TOOK; 1EOS: 0.6TOOK;
That is, before the 11.29 account needs to have EOS balance, the project will start to distribute candy on 12.3 days, the wallet user will be 1:0.5, and the partner will follow 1:0.6. Any condition is not met and you cannot receive the airdrop candy.