I just realized that many people are still unclear about what layer 1 and layer 2 are in crypto. In fact, these are two basic but extremely important concepts to understand the blockchain ecosystem. Today, I will explain to you in the simplest way possible.

First, layer 1 is the foundation of everything. It is the underlying blockchain, the infrastructure on which everything else is built. Bitcoin is the first layer 1 blockchain, with its own independent network. Ethereum is also a layer 1, serving as the platform for DeFi and NFTs. Additionally, there are Solana, Cardano, Avalanche, all of which are major layer 1 blockchains. The strength of layer 1 is that it is completely independent, not reliant on any other platform. Security is also very high because each layer 1 has its own security system, which can be Proof of Work or Proof of Stake. However, the downside is that when the network is overloaded, transactions become slow and fees increase.

As for what layer 2 is, it’s different. It refers to solutions built on top of layer 1 to address congestion issues. Polygon is a typical example; it functions as a layer 2 for Ethereum, helping to reduce fees and significantly increase transaction speed. Arbitrum and Optimism are also layer 2 solutions based on Ethereum. For Bitcoin, the Lightning Network plays a similar role. The advantage of layer 2 is that it inherits security from layer 1 while reducing fees and increasing speed. However, layer 2 depends on layer 1, so sometimes transferring funds between the two layers can be a bit complicated.

In other words, layer 1 is the main platform responsible for managing the entire network and security. Layer 2 consists of supporting solutions that help layer 1 operate more efficiently by reducing load. Understanding this difference will help you grasp how different blockchains work. If you have any more questions about what layer 1 and layer 2 are, just ask me!