Secondary protocols built on top of Layer 1 to increase scalability and reduce transaction fees.
Layer 2 (L2) refers to secondary protocols built on top of Layer 1 blockchains to improve scalability, reduce fees, and increase throughput. Layer 2 solutions inherit the security of the underlying Layer 1 while offering faster and cheaper transactions.
Layer 2 is essential for scaling networks like Ethereum without compromising decentralization.
How Layer 2 Works
Layer 2 systems process transactions off the main chain and periodically submit proofs or bundled data back to Layer 1. Examples include:
Rollups (Optimistic & ZK): Batch thousands of transactions
State Channels: Private off-chain interactions between users
Sidechains: Independent chains connected to L1 via bridges
Validium or hybrid models: Off-chain data with L1 verification
Benefits of Layer 2 Solutions
Significant reduction in gas fees
Faster confirmation times
Higher transaction throughput
Increased application scalability
Lower barriers for onboarding new users
L2s help transform L1 blockchains into globally scalable systems.
Prominent Layer 2 Networks
Arbitrum
Optimism
Base
zkSync
Linea
StarkNet
These ecosystems support DeFi, NFTs, gaming, and more.
Summary
Layer 2 is a scalability layer built on top of Layer 1 blockchains, providing faster, cheaper transactions while maintaining the security of the underlying network.
