ZK Rollup development enables blockchain scalability by bundling transactions off-chain into a single cryptographic proof, then submitting only this proof to the main blockchain, reducing data load and increasing transaction speed. Focused on efficiency, privacy, and low fees, ZK Rollups are especially relevant for Ethereum and high-demand applications like DeFi. Challenges include high computational requirements for zero-knowledge proof generation, yet they promise enhanced scalability without compromising security.