What is Pendle airdrop?

Can you provide a succinct description of Pendle's airdrop? In particular, I'm curious to understand the context, motivation, and implications of such an airdrop in the cryptocurrency landscape. I've heard it mentioned in the community but would like a more in-depth explanation. Specifically, I'm interested in knowing if it's a marketing strategy, a reward for early supporters, or a way to distribute tokens to a wider audience. Additionally, I'd like to understand if there are any eligibility criteria or specific actions required to participate in the airdrop.