🔹 Arbitrum Ecosystem (as of early 2025)
Arbitrum One: The original chain with a thriving DeFi ecosystem.

Arbitrum Nova: Optimized for social and gaming dApps, where ultra-low fees and high throughput are critical.

Arbitrum Orbit: A framework to build custom chains (Layer 3s) using Arbitrum tech, gaining popularity in 2025 for app-specific chains.

🔹 Major Projects on Arbitrum
GMX – Perpetuals DEX and a flagship DeFi protocol.

Radiant Capital – Cross-chain lending.

Treasure DAO – Gaming ecosystem on Arbitrum Nova.

Dopex, Camelot, Pendle – Various DeFi products drawing liquidity to Arbitrum.