Blockchain is a technology that organizes a database consisting of a chain of blocks arranged according to certain rules. Each cell block carries information about the previous cell. This technology is based on the principle of decentralization, that is, the base is not in one place, but in all the computers of the system participants, which form the network. Therefore, the blocks cannot be replaced or hacked because it will have to hack all the computers.
The advantages of this technology are simplicity, speed, security, transparency. For example, if a transaction was made in the blockchain network, information about it will remain in a million computers, that is, will never be lost or forged.
Blockchain technology is the basis of the work of cryptocurrencies.