This article delves into Directed Acyclic Graph (DAG) technology and its implications for the cryptocurrency industry, contrasting it with traditional blockchain systems. It discusses how DAG provides faster transaction speeds, scalability, and energy efficiency. Key points include DAG mechanics, use cases, and pros and cons. The article targets fintech professionals, cryptocurrency enthusiasts, and developers seeking efficient transaction systems. It offers an overview of the applications in cryptocurrencies like IOTA, Nano, and BlockDAG and addresses the evolving landscape of DAG versus blockchain. Keywords: DAG technology, cryptocurrency, blockchain, scalability, transaction speed.