Tangle

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Tangle is the moniker used to describe IOTA’s directed_acyclic_graph_dag based transaction settlement and data integrity layer focused on the internet_of_things_iot. The Tangle is essentially a string of individual transactions that are interlinked to each other and stored through a decentralized network of node participants.

Importantly, the Tangle does not have miners as users of the network function as the miners themselves through performing small computational proof_of_work for each transaction by verifying previous transactions submitted to the network. Focused on allowing the network to scale for a global micropayment network of interconnected IoT devices, The Tangle is designed to offer a solution to the heterogeneous nature of current blockchain systems.

Source: What is The Tangle? Complete Guide to IOTA’s Directed Acyclic Graph (DAG)