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"Crypto" is a common term used to refer to "cryptocurrencies," which are digital or virtual currencies that use cryptography techniques to secure and verify transactions and to control the creation of new units. Cryptocurrencies operate independently of central banks and governments and are decentralized, meaning they are not subject to traditional financial regulations.

The most well-known cryptocurrency is Bitcoin, which was created in 2009 by an anonymous person or group using the pseudonym "Satoshi Nakamoto." Since then, thousands of other cryptocurrencies have been created, including Ethereum, Litecoin, and Ripple.

Cryptocurrencies are often bought and sold on online exchanges and can also be used to purchase goods and services from merchants who accept them as payment. They have gained popularity in recent years as a form of investment, with some people buying them in the hopes that their value will increase over time.

However, cryptocurrencies are also subject to high volatility and have been associated with various risks, including security breaches, fraud, and regulatory uncertainty. As a result, investing in cryptocurrencies can be risky and should be approached with caution.