Crypto Basics #16 — Understanding Layer 2

A Layer 2 is a network built on top of an existing blockchain to make it faster and cheaper to use. The original blockchain, like Ethereum, is the Layer 1. The Layer 2 sits above it.

The problem it solves is congestion. When a popular blockchain gets busy, transactions slow down and gas fees climb, as we saw a few posts back. A Layer 2 takes the load off by handling transactions away from the main chain, bundling many of them together, and then settling the final result back on Layer 1.

The clever part is where the trust comes from. A Layer 2 still relies on the underlying blockchain for security. You get much lower fees and faster transactions, while the main chain remains the anchor that everything ultimately settles to. It's extra capacity without giving up the security of the base layer.

This approach has become a central part of how Ethereum scales. Rather than forcing every transaction onto one chain, the ecosystem spreads activity across several Layer 2 networks. As crypto use grows, this kind of infrastructure is what allows large numbers of people to transact without fees becoming painful.

In short: A Layer 2 is a network built on top of a blockchain to deliver faster, cheaper transactions while still relying on the base chain for security.

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