L1 vs L2, without the jargon

Think of a Layer 1 as a highway. Bitcoin, Ethereum, Solana – the base roads every transaction ultimately settles on. Secure and decentralized, but when traffic spikes, everyone competes for the same lanes. That's when fees rise and confirmations slow.

A Layer 2 is an express lane built on top. It bundles transactions, processes them off to the side, then posts the final result back down to the L1. You get the speed and low fees of the side road while still inheriting the base layer's security. Arbitrum, Base, and Optimism work this way for Ethereum.

Why it matters to you: the same swap can cost cents on an L2 and noticeably more on the L1 at a busy moment. Knowing which layer you're on explains a fee difference most people never question.

One catch: moving between an L1 and an L2 means using a bridge, and bridges have been one of crypto's most exploited points. Worth respecting when you cross.

What would you want explained next, simply? 👇