Acropolis - The high point or citadel of an ancient Greek city, like the Acropolis in Athens. It is generally a raised area above the rest of the city where the most important sacred and secular buildings are brought together. The buildings on the Athenian Acropolis were important for trade and worship.
Bitcoin is a digital currency (also called crypto-currency) that is not backed by any country's central bank or government. Bitcoins can be traded for goods or services with vendors who accept Bitcoins as payment.
What is Bitcoin? It's a decentralized digital currency; Why Use Bitcoin? It's fast, cheap to use, and secure; How Can I Buy Bitcoins? From an exchange or an individual; How to Buy Bitcoin in the UK Buying bitcoin in the UK; How to Store Your Bitcoins Use a digital or paper wallet; What Can You Buy with Bitcoin? Spend your bitcoins; How to Sell Bitcoin