A block is a unit of data within a blockchain that contains a group of validated transactions. Each block is linked to the previous one, forming a continuous and secure chain of records over time. This structure allows blockchains to function as transparent and tamper-resistant systems for storing information.

A block stores transactions and connects them securely to the blockchain.

Each block contains important information such as a list of transactions, a timestamp, and a cryptographic hash of the previous block. This structure ensures that blocks are securely connected, making it extremely difficult to alter past data without affecting the entire chain. When a new block is created, it must be validated by the network through a consensus mechanism before being added to the blockchain. This process ensures transparency, security, and trust within the system, while also preventing fraud or double spending within the network.

Short example:

Suppose several Bitcoin transactions take place at the same time.

These transactions are grouped together into a single block.

Once the block is validated and added to the blockchain, all transactions inside it become part of the permanent and secure record.

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