What is Blockchain? Explained.

 A blockchain is a type of distributed ledger, which is a database that is spread across a network of computers. Each block in a blockchain contains a set of transactions that have been grouped together, and once a block has been added to the blockchain, the data in it cannot be altered.

In a blockchain, each block is linked to the previous block, creating a chain of blocks. This linking is done through the use of cryptographic hashes, which are a type of digital fingerprint that ensures the integrity of the data in the block.

One of the key features of a blockchain is that it is decentralized, meaning that it is not controlled by any single entity. Instead, the network of computers that maintain the blockchain collectively ensure its integrity. This decentralized architecture makes blockchains resistant to censorship and tampering, as there is no single point of failure.

The first blockchain was created as the underlying technology for Bitcoin, but today there are many different types of blockchains, each with their own unique characteristics. Some are open and public, while others are private and permissioned. Some are fast and highly scalable, while others are slow and have low transaction throughput.

One of the most popular blockchain today is the Ethereum blockchain, which is designed to be a platform for building decentralized applications (dapps). Dapps are applications that run on a blockchain, and are able to leverage its security and decentralization features.

Blockchain technology also has a wide range of use case, like in Supply Chain, Banking, Healthcare, Gaming and Voting.