What Is Blockchain?

The blockchain is basically a large, digital, public record, or digital ledger. The most popular blockchains are distributed across many people’s computers (also called “nodes”), which is why you’ll often hear them described as “decentralized.”
Every time a new transaction is created, it is added to a block, and each block in the chain contains multiple transactions. Once a block is added to the chain, it cannot be altered or deleted.
Blockchains use complex algorithms and consensus mechanisms to ensure that each copy of the ledger is identical, and that every transaction is valid. This creates a permanent and unchangeable record of all transactions on the blockchain.
So, being distributed across a peer-to-peer network instead of a centrally owned server, helps ensure that the blockchain remains immutable. Because the blockchain records and preserves all transaction history, it is uniquely positioned to transform provable authenticity and digital ownership.This decentralization makes blockchains highly secure and resistant to fraud or tampering.