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  1. Home
  2. /Glossary
  3. /Layer 2
Back to Glossary
blockchain

Layer 2

A secondary network built on top of a Layer 1 to improve scalability.

Definition

A secondary network built on top of a Layer 1 to improve scalability. L2s process transactions off the main chain and periodically settle back to it. Arbitrum, Optimism, and Base are Ethereum L2s that offer cheaper, faster transactions.

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Learn More About Layer 2

GuideWhat is Ethereum? Complete GuideGuideLayer 2 Solutions GuideBlogThe L2 Wars Are Over and Arbitrum Already WonBlogEthereum's Blob Fees Are Generating Almost Nothing. Is That a Problem?BlogBase Is Eating Ethereum's Lunch and Coinbase Is Loving It

Related Terms

Layer 1

The base blockchain that processes and finalizes transactions.

Scalability

A blockchain's ability to handle increasing transaction volume without degrading performance or raising fees.

Rollup

A Layer 2 scaling solution that bundles many transactions together before posting them to the main chain.

ABI

Application Binary Interface.

Account Abstraction

A way to make crypto wallets behave more like normal apps by turning every account into a smart contract.

ERC-4337

The Ethereum standard for account abstraction without changing the core protocol.

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