# Terminology

**Trac Network vs. Blockchains Terminology Comparison**

Main Settlement Bus (MSB) ⇒ Transaction ledger

Apps ⇒ Smart Contract ledgers

MSB and Apps may be used as:

Indexers ⇒ Archive nodes (consensus, index)

Writers ⇒ Nodes (validators : full nodes, apps: light nodes)

Readers ⇒ Read-only nodes (statistics, 3rd party applications)


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