# What is blockchain? The data on the blockchain is stored in a decentralized manner, meaning that it is not held in a central location, but is instead duplicated and stored across many computers, or nodes, on the network. This makes the blockchain highly resistant to hacking or data corruption, as an attacker would need to gain control of a majority of the nodes on the network to change the data. Blockchains are most commonly associated with cryptocurrencies, such as Bitcoin, as they are used to record and verify transactions on the network. However, blockchains have many other potential applications, such as supply chain management, voting systems, and identity verification, as they can provide a secure and transparent record of any type of transaction or information exchange. A blockchain is a decentralized digital ledger that records transactions on multiple computers simultaneously. Each block on the chain contains a record of several transactions, and once a block is added to the chain, it cannot be altered or deleted. This makes it an extremely secure way to store and transfer information. Source