Cryptocurrency is a digital payment system that doesn't rely on banks to verify transactions. It’s a peer-to-peer system that can enable anyone anywhere to send and receive payments. Transactions are verified by network nodes through cryptography and recorded in a public dispersed ledger called a blockchain. Bitcoin, the first and most well-known cryptocurrency, was created in 2009. Cryptocurrencies are often traded on decentralized exchanges and can also be used to purchase goods and services.

There are a few ways to earn cryptocurrencies online. One way is to mine them. Mining is how new units of cryptocurrency are created. Miners are rewarded with cryptocurrency for verifying and committing transactions to the blockchain. Another way to earn cryptocurrency is to participate in Initial Coin Offerings (ICOs). ICOs are crowdfunding events where companies offer new tokens in exchange for cryptocurrency. Finally, some cryptocurrency exchanges offer rewards, such as airdrops or staking, for holding certain tokens on their platform.