Regular money (like dollars) can be printed in unlimited amounts by governments. This can make each dollar worth less over time - that's called inflation. Bitcoin is different because there will only ever be 21 million, so it can't be inflated away.

Think about your allowance money. Let's say you get $10 a week, and a candy bar costs $1. You can buy 10 candy bars with your allowance. But what if next year, the same candy bar costs $2? Now your $10 only buys 5 candy bars. That's inflation - your money buys less stuff over time.

Why does this happen? One big reason is that governments can print as much money as they want. When they print too much, each dollar becomes worth less, and prices go up.

Bitcoin is different. No one can make more Bitcoin beyond the 21 million that will ever exist. This means Bitcoin can't be "inflated away" by creating more and more of it.

Here are some other differences between Bitcoin and regular money:

• Control: Regular money is controlled by banks and governments. Bitcoin is controlled by its users.
• Privacy: When you use a credit card, the bank knows what you bought. Bitcoin gives you more privacy (though it's not completely private).
• Access: You need a bank account to use digital regular money. Anyone with internet access can use Bitcoin.
• Sending: Sending regular money to other countries can be slow and expensive. Bitcoin can be sent anywhere in the world quickly.

These differences are why some people call Bitcoin "sound money" - money that keeps its value over time and can't be controlled by others.