This document provides an overview of cryptocurrency and how it works. It explains that cryptocurrency is a digital currency secured by cryptography, produced by solving complex algorithms. It is not backed by any government or bank. The document outlines how cryptocurrency can be "mined" through solving algorithms to earn coins as a reward. It also discusses how Bitcoin was the first cryptocurrency and how there are now many alternative coins. In under 3 sentences, the document introduces cryptocurrency as a digital currency secured by cryptography and produced through solving algorithms, explains that individuals can mine coins by using their computers and resources to solve algorithms, and states that Bitcoin was the first cryptocurrency but there are now many alternative coins.