A cryptocurrency is a medium of exchange traditional currencies such as USD, however designed for the aim of exchanging digital info through a method created potential by bound principles of cryptography.
Cryptography is employed to secure the transactions and to control the creation of recent coins. The primary cryptocurrency to be created
was Bitcoin back in 2009. Nowadays there are many alternative cryptocurrencies, typically called as Altcoins.
Bitcoin is a consensus network that enables a new payment system and a completely digital money. It is the first decentralized peer-to-peer payment network that is powered by its users with no central authority or middlemen.
From a user perspective, Bitcoin is pretty much like cash for the Internet. Bitcoin can also be seen as the most prominent triple entry bookkeeping system in existence.
Altcoins are cryptocurrencies other than Bitcoin. The majority of altcoins are forks of Bitcoin or alternative way to provide additional security.
The most popular cryptocurrencies in 2016 are:
You can check cryptocurrency market capitalizations Here
You can buy BTC here (hotlinks):
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