This beginner's guide to Zero-Knowledge Proofs (ZK) explores its role in enhancing blockchain security, privacy, and scalability. It explains ZK technology, focusing on ZK rollups, protocols, interoperability, and applications in DeFi. The article addresses key challenges in blockchain networks, presenting solutions like ZK rollups to improve efficiency and security. Highlighting projects leveraging ZK technology, the guide is ideal for blockchain enthusiasts and developers seeking to understand ZK's impact on decentralized ecosystems, optimizing privacy and scalability. Keywords: ZK technology, blockchain security, ZK rollups, DeFi, zero-knowledge proofs.