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Cryptocurrency is a digital asset that uses cryptography and may use a distributed ledger such as a blockchain. It is not issued or guaranteed by a central bank, and its value can change significantly with market demand and supply. Cryptocurrencies may be used to transfer value or traded in markets. Examples include Bitcoin, Ethereum, Litecoin, and Ripple.

Many cryptocurrencies, like Bitcoin, are created through a process called mining, which involves solving complex mathematical equations to validate and record transactions on a blockchain. This mechanism is also called Proof of Work (PoW). Another consensus mechanism that has increased in popularity — as it is more energy efficient — is Proof of Stake (PoS). Instead of mining, PoS relies on network participants validating transactions. Ethereum, the second-largest cryptocurrency, uses this consensus mechanism.

Bitcoin is a cryptocurrency that operates on a peer-to-peer (P2P) network. It was created in 2009 by an unknown person or group using the pseudonym Satoshi Nakamoto. Bitcoin is the first and most well-known cryptocurrency, and it has gained significant popularity and value since its creation. Unlike traditional fiat currency, which is controlled by central banks and governments, Bitcoin operates independently of any central authority. Transactions are verified and recorded on the blockchain, which is a distributed ledger that maintains a permanent and transparent record of all transactions.

Return on Investment (ROI) is a popular profitability metric used to evaluate how well an investment has performed. ROI is expressed as a percentage and is calculated by dividing an investment's net profit (or loss) by its initial cost or outlay. ROI is calculated by subtracting the initial cost of the investment from its final value, then dividing this new number by the cost of the investment, and finally, multiplying it by 100.

For example, an investment made for $100 and later valued at $120 has a $20 gain and a 20% ROI before fees and taxes. An investment can also lose value; past performance does not predict future results.

The original Bitcoin code was designed by Satoshi Nakamoto under MIT open source credentials. In 2008 Nakamoto outlined the idea behind Bitcoin in his White Paper, which scientifically described how the cryptocurrency would function. Bitcoin is the first successful digital currency designed with trust in cryptography over central authorities. Satoshi left the Bitcoin code in the hands of developers and the community in 2010. Thus far hundreds of developers have added to the core code throughout the years.

Bitcoin mining is analogous to the mining of gold, but its digital form. The process involves specialized computers solving algorithmic equations or hash functions. These problems help miners to confirm blocks of transactions held within the network. Bitcoin mining provides a reward for miners by paying out in Bitcoin in turn the miners confirm transactions on the blockchain. Miners introduce new Bitcoin into the network and also secure the system with transaction confirmation. They are also rewarded network fees for when they harvest new coin and a time when the last bitcoin is found mining will continue.

This is a yet another controversial topic. Because of the freedom and the degree of anonymity that the use of Bitcoin offers, many users who were seeking to purchase or solicit illegal goods or services initially turned to the use of Bitcoin as a method of payment.

The Bitcoin network is decentralized, but exchanges, businesses, and individuals may still be subject to laws in the places where they operate. Rules differ by jurisdiction and can change over time.

Bitcoin is generally described as pseudonymous rather than anonymous. Transactions and addresses are publicly viewable on the blockchain, and addresses may sometimes be connected to real-world identities.

Bitcoin may be sold through cryptocurrency exchanges or other services, subject to availability, local rules, fees, and the platform's terms. Review the risks and requirements before using a service.