Blockchain is a distributed ledger technology that allows for secure, transparent, and tamper-proof transactions. It works by creating a chain of blocks that contain information, and each block is linked to the previous one, forming a chain. This structure ensures that once a block is added to the chain, it cannot be altered without changing all subsequent blocks, making it virtually impossible to hack or modify the data.

Blockchain is most commonly associated with cryptocurrencies, such as Bitcoin and Ethereum, but its potential applications go beyond that. It can be used for a variety of purposes, including supply chain management, voting systems, and digital identity verification. Its decentralized nature allows for greater transparency and accountability, making it a promising technology for a wide range of industries.