Yearnlab is a DeFi platform based on Binance Smart Chain, aiming to provide updated services to its community. It offers opportunities to earn high APY on YLB staking, provides staking as a service, and allows users to create their own tokens and set up custom staking pools. The presale is currently live, starting on December 7th at 16 UTC. It's part of a broader ecosystem with similar projects like DeFiLab and 8Bit Chain, focusing on decentralized exchanges, passive income streams, and comprehensive DeFi solutions.