Blockchain – Glossary Definition

What is a Blockchain?

A blockchain is a distributed digital ledger that records transactions across a network of computers in a way that ensures the data is secure, transparent, and tamper-proof.

Each transaction is grouped into a “block” and added to a chronological “chain” of previous transactions—hence the name blockchain. This structure is decentralized, meaning no single entity controls the data, and it’s maintained collectively by all participants in the network.

🔑 Key Features of Blockchain:

• Decentralization:
  Unlike traditional databases managed by a central authority, blockchains operate across a peer-to-peer network.
• Transparency:
  Most blockchains are public, allowing anyone to view the transaction history.
• Immutability:
  Once a block is recorded and confirmed, its data cannot be changed or deleted without altering the entire chain.
• Security:
  Blockchain uses cryptographic algorithms to ensure that transactions are verified and protected from tampering.

🧠 Common Use Cases

• Cryptocurrencies (e.g., Bitcoin, Ethereum)
• Supply Chain Tracking
• Digital Identity Verification
• Smart Contracts
• Voting Systems
• Financial Services (DeFi)

📌 Types of Blockchains

🧾 Related Terms

• Distributed Ledger Technology (DLT)
• Smart Contract
• Tokenization
• Consensus Mechanism
• Cryptographic Hash

🤔 Why It Matters

Blockchain technology is the foundation of the modern decentralized internet, reshaping industries from finance to logistics. Understanding how it works is essential for anyone engaging with digital assets, fintech, or emerging technologies.

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