I just saw many people confusing Layer 1 and Layer 2 in crypto, so I want to quickly share this with everyone.

Actually, what Layer 1 and Layer 2 are is quite simple if you understand the core concept correctly. Layer 1 refers to the original blockchains, independent platforms that operate on their own. Bitcoin is the first blockchain, with its own complete network. Ethereum, Solana, Cardano, Avalanche — these are also Layer 1, each with its own security system and consensus mechanism (Proof of Work or Proof of Stake or something like that). DApps, NFTs, DeFi are all built directly on these Layer 1 blockchains.

The advantage of Layer 1 is that it’s independent, not dependent on anyone. Security is also solid because each has its own system. But the problem is, when the network gets overloaded, transactions slow down, and fees spike. Ethereum used to have this problem quite heavily.

Then comes Layer 2, which are solutions built on Layer 1 to address speed and fee issues. Polygon is a classic example for Ethereum, helping to significantly reduce fees and increase transaction speed. Arbitrum, Optimism are similar; they are Layer 2 solutions for Ethereum, easing the load on the main network. Bitcoin has Lightning Network, which is also Layer 2, making BTC transactions faster and cheaper.

The benefit of Layer 2 is that fees are much lower, and speed is faster thanks to reduced load. It still inherits security from Layer 1, so it’s also safe. But it depends on Layer 1, so sometimes switching back and forth between the two layers can be a bit complicated.

To sum up, if you’re not clear about what Layer 1 and Layer 2 are: Layer 1 is the foundational blockchain (Bitcoin, Ethereum, Solana), managing the network and security. Layer 2 are support solutions to increase speed and reduce fees (Polygon, Arbitrum, Lightning Network).

Understanding this helps you see why some projects choose to build on Layer 2 instead of Layer 1, or why the main network needs these scaling solutions. If you have any questions about the Layers, just comment and ask me. I also keep an eye on new projects on Gate to stay updated with the market.