As a crypto analyst with a deep dive into blockchain scalability, I explore why rollups require robust data availability (DA) layers and how Ethereum's EIP-4844 (Proto-Danksharding) addresses this need. This article breaks down the technical nuances of DA, the role of blob-carrying transactions, and their impact on rollup efficiency. Whether you're a developer or trader, understanding these mechanisms is key to navigating the future of L2 solutions.