> For the complete documentation index, see [llms.txt](https://arb-20.gitbook.io/whitepaper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://arb-20.gitbook.io/whitepaper/introduction.md).

# Introduction

- [Arbitrum is a Layer 2 network on Ethereum designed to optimize transaction speed and reduce gas cost](https://arb-20.gitbook.io/whitepaper/introduction/arbitrum-is-a-layer-2-network-on-ethereum-designed-to-optimize-transaction-speed-and-reduce-gas-cost.md)
- [Brief introduction to the ARB20 token and its unique features.](https://arb-20.gitbook.io/whitepaper/introduction/brief-introduction-to-the-arb20-token-and-its-unique-features..md)