Layer 3: The "App-Specific" Chains: We started with Bitcoin (Layer 1). Then we got Arbitrum and Optimism (Layer 2). Now, in 2026, we have Layer 3s. These are blockchains built for one specific purpose. Imagine a blockchain that only handles high-speed gaming transactions, or a chain that only handles medical records. By narrowing the focus, these chains can be incredibly fast and customized. You might be using a Layer 3 today without even knowing it because the experience is as smooth as a regular app.