Blockchain is a type of database technology that stores information in a very special way.Instead of being saved on one central computer (like a bank or a company server), it is saved on many computers all over the world at the same time. These computers work together to keep one shared record of information.Here’s what makes it special:Blocks & ChainsInformation (like transactions) is grouped into “blocks.” Each block is linked to the one before it, forming a chain — that’s why it’s called block-chain.DecentralizedNo single company or person controls it. Everyone in the network can see and verify the information.Secure & Hard to ChangeBecause every block is linked and stored on many computers, it’s extremely difficult to change past data without everyone noticing. This makes it trustworthy.TransparentAnyone on the network can view the records (depending on the type of blockchain).ExamplesBitcoin and Ethereum use blockchain to record who sends and receives coins. But blockchain isn’t just for money — it can be used for supply chains, digital IDs, voting systems, health records, and more.In simple words:A blockchain is like a public, digital notebook that is copied to thousands of computers. Every time something new is written (like a transaction), everyone gets the same update, so nobody can secretly change it.
