Why does Ethereum need Layer 2?

Описание: Ethereum is secure and decentralized — but that limits throughput and raises fees during congestion.

In this video:

Why Ethereum needs Layer 2
What each layer does — from transaction to settlement
How rollups batch transactions to cut costs
Optimistic vs ZK rollups — the two main models
What changes for users: speed, fees, and wallets

Timestamps:
0:00 — The scaling problem
1:20 — What each layer does
2:45 — Why rollups reduce cost
4:10 — Optimistic vs ZK rollups
6:00 — What changes for users

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