Cryptocurrency: 

A blockchain enabled digital currency that is secured by cryptography. The primary function of a cryptocurrency is to act as a medium of exchange within a peer-to-peer economic network. 

Many cryptocurrencies, including Bitcoin, are decentralized, meaning they do not have a central authority, and are maintained by a distributed network of computers, nodes, and miners around the world.

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Links:

• Cryptocurrency Definition – Investopedia

• What is a cryptocurrency? – Blockgeeks