What are Cryptocurrencies?

Cryptocurrencies are digital or virtual currencies that use cryptography for security and operate on decentralized networks based on blockchain technology.

Key Features of Cryptocurrencies:

• Decentralization:
  Cryptocurrencies are not controlled by any central authority, such as a government or bank. They operate on a peer-to-peer network where every participant (node) maintains a copy of the transaction ledger (blockchain).

• Blockchain Technology:
  Most cryptocurrencies run on a blockchain—a distributed ledger that records all transactions in a secure, transparent, and immutable way. Each transaction is grouped into a block, and blocks are linked together chronologically using cryptographic hashes, making the ledger tamper-proof.

• Cryptography:
  Transactions and user identities are secured using advanced cryptographic techniques. Users have a pair of cryptographic keys: a public key (used as an address) and a private key (used to sign transactions). This ensures privacy and security.

• Digital and Global:
  Cryptocurrencies exist only in digital form and can be transferred globally, instantly, and at any time, without intermediaries.

• Limited Supply:
  Many cryptocurrencies, like Bitcoin, have a fixed maximum supply, which means only a certain number of coins will ever exist. This scarcity can affect their value.

How Cryptocurrencies Work:

1. Transaction Initiation:
   A user initiates a transaction (for example, sending Bitcoin to another user) using their private key to sign the transaction.

2. Broadcast and Validation:
   The transaction is broadcast to the network, where nodes (computers) validate it using consensus mechanisms like Proof of Work (PoW) or Proof of Stake (PoS).

3. Block Formation:
   Validated transactions are grouped into a block. Each block includes a cryptographic hash of the previous block, linking them together securely.

4. Consensus and Addition:
   The network reaches consensus, and the new block is added to the blockchain. This process is transparent and visible to all participants, ensuring trust and accountability.

5. Immutability:
   Once recorded, transactions cannot be altered or deleted, ensuring a permanent, tamper-proof record.