Solana Hack Day is a blockchain hackathon in Vietnam that brings together blockchain enthusiasts. Participants utilize four Solana platform SDKs, including Shyft, Gum, Underdog, and CandyPay. These SDKs empower developers to build decentralized applications, integrate NFTs, create DeFi solutions, and implement efficient payment systems. The hackathon provides an immersive environment for participants to explore the possibilities of blockchain technology and showcase their talents.