Cryptocurrency is a digital form of currency that operates independently of a central authority. It uses decentralized blockchain technology to record transactions securely across a network of computers.Cryptocurrencies rely on cryptographic security measures to ensure the integrity of transactions and control the creation of new units, mining or validation processes maintain the network and prevent double-spending.

Blockchain is a decentralized digital ledger technology that records transactions securely across a network of computers. It creates an immutable chain of blocks, each containing transaction data and a cryptographic hash of the previous block. This technology enables transparent and secure record-keeping without the need for intermediaries.
Public and private keys are paired cryptographic keys used in encryption systems. The public key, as the name suggests, is openly shared and is used to encrypt messages or verify digital signatures. The private key, on the other hand, is kept secret and is used to decrypt messages encrypted with the corresponding public key or to create digital signatures.

To buy cryptocurrencies, sign up for an account on a reputable exchange like Coinbase or Binance. Deposit funds using a bank transfer or card. Place an order to buy your chosen cryptocurrency, specifying the amount and price. Once purchased, transfer your cryptocurrency to a secure wallet for safekeeping. Remember to choose a reliable exchange with strong security measures.