What is Cryptocurrency?
A cryptocurrency is a digital or virtual currency that is secured by cryptography, which makes it nearly impossible to counterfeit or double-spend. Many cryptocurrencies are decentralized networks based on blockchain technology—a distributed ledger enforced by a disparate network of computers. A defining feature of cryptocurrencies is that they are generally not issued by any central authority, rendering them theoretically immune to government interference or manipulation.

Examples are: BTC, XRP, ETH, BHC 

What is cryptocurrency trading and how does it work?
ryptocurrency trading involves speculating on price movements via a CFD trading account, or buying and selling the underlying coins via an exchange. 

Halimbawa: if you bought XRP worth 1000PHP at the price of 17 PHP. That'll give 58.82 XRPs. After a week the 17 PHP price of XRP increases to 30 PHP. That means the price increases 77%, and so is your profit. 77% of your 1000 pesos is 770 pesos, that would make it your gain. 

You can watch some YouTube videos on how cryptocurrency trading works