Too Long; Didn't Read
The Directed Acyclic Graph (DAG) is a form of a Distributed System Technology (DLT) and is a subset under the DLT umbrella. DAGs and blockchains are not the same thing at all; although they store and record their transactions on distributed ledgers, they do so in conspicuously different ways. The race is on for the development of a DAG, and there are many who believe that it will play a big part in that. Some consider it as a rival technology to blockchain, whilst many others see it as an enabler.