# Rollups: Analogies

### The Receipt Bundle Analogy

Imagine you go shopping with a group of friends. Instead of each person paying separately and getting their own receipt, you all give your items to one friend who makes a single purchase.

That friend gets **one receipt** covering everyone's purchases.

If anyone wants to verify what was bought, they can simply look at that one receipt—it’s faster and more efficient than tracking down ten separate receipts.

> **Rollups work the same way**: rather than recording each transaction individually on-chain, they bundle many transactions off-chain and submit one proof. This reduces costs, saves space, and keeps the blockchain efficient.

### The High-Speed Train Analogy

Think of traditional blockchain transactions as people driving individual cars down a single-lane road—each car moves one-by-one, and traffic builds up quickly.

Now imagine a **high-speed train**. Passengers (transactions) board off-chain, and the train (rollup) carries them all together. At the end, the train submits a **manifest** (proof) showing who rode the train.

> This keeps the blockchain from getting congested, while still recording everything securely.