Blockchain

Blockchain is a distributed, immutable ledger shared across a network, making it secure and transparent. Transactions are grouped into blocks, cryptographically linked to form a chain, making them tamper-proof.

While known for cryptocurrencies, blockchain has broader applications like supply chain tracking, healthcare records, secure voting, digital identity, and smart contracts.

Challenges include scalability, energy consumption (for some types), regulation, and complexity. However, its potential for secure and efficient systems across various industries is significant and continues to grow.