# key concepts

- [Total Value Locked(TVL)](/key-concepts/total-value-locked-tvl.md)
- [Zero-Knowledge Rollup](/key-concepts/zero-knowledge-rollup.md)
- [zkEVM](/key-concepts/zkevm.md)
- [Layer 3](/key-concepts/layer-3.md)
- [Modular Blockchain](/key-concepts/modular-blockchain.md)
- [Token Merge](/key-concepts/token-merge.md)