https://docs.arbitrum.io/welcome/arbitrum-gentle-introduction
https://www.kvarnx.com/content/understanding-arbitrum-your-guide-to-layer-2-scaling
- a technology suite designed to scale Ethereum
- a collective term to describe a specific set of Ethereum scaling solutions. A layer 2 is a separate blockchain that extends Ethereum and inherits the security guarantees of Ethereum.
- https://ethereum.org/en/layer-2/#use-layer-2