> For the complete documentation index, see [llms.txt](https://docs.trac.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.trac.network/documentation/trac-network/terminology.md).

# 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)