Blockchain
Blockchain is a decentralized, distributed ledger technology that records transactions across multiple computers in a way that ensures security, transparency, and immutability. It enables peer-to-peer transactions without intermediaries, using cryptographic techniques to create a chain of blocks containing data. This technology underpins cryptocurrencies like Bitcoin and Ethereum, but also supports smart contracts, supply chain tracking, and digital identity management.
Developers should learn blockchain to build decentralized applications (dApps), implement secure and transparent systems for finance, voting, or supply chains, and leverage smart contracts for automated, trustless agreements. It's essential for roles in fintech, Web3, and industries requiring tamper-proof record-keeping, such as healthcare or logistics, where data integrity and auditability are critical.