# Layer 2

## Definition

Layer 2 is a scaling system built on top of a base blockchain such as Ethereum that executes or batches activity outside the base layer while relying on the base chain for some form of settlement, data or security.

## What it means in practice

Different L2 designs use different rollup, bridge, fee and finality mechanisms. Assets on an L2 are not automatically the same balance as assets on Ethereum mainnet.

## How this concept appears in Terenval Wallet

Terenval Wallet includes several Ethereum L2 networks such as Optimism, Arbitrum One and Base alongside Ethereum mainnet.

**Important:** Verify the exact L2 network and bridge path before moving assets; a lower fee does not remove cross-network compatibility risk.

**[Install Terenval Wallet](https://wallet.terenval.com/?lang=en)**

## Related terms

- [Ethereum](https://wallet.terenval.com/glossary/ethereum/)
- [ETH](https://wallet.terenval.com/glossary/eth/)
- [Gas fee](https://wallet.terenval.com/glossary/gas-fee/)
- [Multi-chain wallet](https://wallet.terenval.com/glossary/multi-chain-wallet/)
- [Network fee](https://wallet.terenval.com/glossary/network-fee/)

## Related Terenval Answers

- [How to Send Crypto Safely Between Wallets](https://wallet.terenval.com/answers/how-to-send-crypto-safely-between-wallets/)
- [Ethereum Layer 2 Networks and Gas Fees](https://wallet.terenval.com/answers/ethereum-layer-2-networks-and-gas-fees/)
- [Can One Crypto Wallet Manage Multiple Blockchains?](https://wallet.terenval.com/answers/can-one-crypto-wallet-manage-multiple-blockchains/)

## Sources and review

- [Terenval supported networks](https://wallet.terenval.com/info/supported-networks/)
- [Ethereum.org — transactions](https://ethereum.org/en/developers/docs/transactions/)
- [Bitcoin.org — how Bitcoin works](https://bitcoin.org/en/how-it-works)

Published by Terenval. Technical review: Terenval Wallet team. Last reviewed: 2026-10-02. Terenval product statements are first-party information.

Official page: https://wallet.terenval.com/glossary/layer-2/

[Machine-oriented Terenval index](https://wallet.terenval.com/llms.txt)