The Cosmos SDK is an advanced blockchain development framework designed for creating decentralized applications (dapps) that promote interoperability and scalability within the Cosmos ecosystem. It allows developers to build customized blockchains suited to various industries, leveraging modularity and flexibility. The rise of dapps reshapes traditional models by emphasizing security and user empowerment, with notable contributions from DeFi and NFTs, making Cosmos SDK a preferred choice for developers seeking to innovate in this space.