The main point of cryptocurrency is to fix the problems of traditional currencies by putting the power and responsibility in the currency holders' hands. All of the cryptocurrencies adhere to the 5 properties and 3 functions of money. They each also attempt to solve one or more real-world problems. 
Cryptocurrencies let you buy goods and services, or trade them for profit. Here's more about what cryptocurrency is, how to buy it and how to protect yourself.

1. What is cryptocurrency?Cryptocurrency is a form of payment that can be exchanged online for goods and services. Many companies have issued their own currencies, often called tokens, and these can be traded specifically for the good or service that the company provides. Think of them as you would arcade tokens or casino chips. You’ll need to exchange real currency for the cryptocurrency to access the good or service.Cryptocurrencies work using a technology called blockchain. Blockchain is a decentralized technology spread across many computers that manages and records transactions. Part of the appeal of this technology is its security.