How do blockchain networks maintain security and trust?

Blockchain networks keep things safe and trusted by working together like a group of friends who all agree on the same story.

Imagine you and your friends are playing a game where everyone has to agree on what happened in the game, no one can cheat or lie. If someone tries to change the story, the whole group checks it again. That’s how blockchain works.

In a blockchain network, every person (or computer) is like your friend. When something happens, like a transaction, everyone in the group sees it and agrees on what happened. They write this down together in a ledger, which is like a shared notebook that no one can change without everyone knowing.

If someone tries to say, "I got an extra candy," but no one else saw it happen, the group checks again. If most of the friends agree on what actually happened, they update the notebook together. This makes sure no one person or group can control everything, it’s fair for everyone.

That's why blockchain networks are secure and trusted, because everyone has to agree, and there's always a record of what really happened.