### **Layer 2 Solutions:**

Layer 2 solutions aim to improve scalability and reduce transaction costs on blockchain networks, particularly Ethereum.

1. **Polygon #MATIC **: A leading Layer 2 scaling solution for Ethereum, offering fast, low-cost transactions.

2. **Optimism #OP **: A Layer 2 chain that uses Optimistic Rollups to scale Ethereum.

3. **Arbitrum #ARB **: Another Layer 2 solution for Ethereum, using rollups to improve scalability and reduce fees.

4. **Loopring #LRC **: A protocol for building decentralized exchanges with high throughput and low transaction fees using zk-Rollups.

5. **Immutable X #IMX **: A Layer 2 solution specifically for NFTs, enabling fast and gas-free transactions for digital collectibles.

### Key Takeaways:

- **DeFi** coins are mostly related to decentralized financial services, like lending, borrowing, and trading.

- **NFT** coins are linked to the digital ownership of assets like art and in-game items.

- **Layer 2** solutions aim to scale Ethereum and other blockchain networks, reducing transaction costs and increasing speed.