What is IOTA?

IOTA is a distributed ledger system that focuses on transactions serving the Internet of Things (IoT). IOTA utilizes Tangle, which uses a Directed Acyclic Graph (DAG) data structure instead of a blockchain-based architecture. Its DAG structure places transaction confirmation on IoT nodes rather than the block-based system of blockchain. IOTA offers zero-fee transactions and claims to have a high transaction throughput.