A stock is a type of investment that represents an ownership share in a company. Investors buy stocks that they think will go up in value over time.
Cryptocurrency, sometimes called crypto-currency or crypto, is any form of currency that exists digitally or virtually and uses cryptography to secure transactions
A commodity is a basic good used in commerce that is interchangeable with other goods of the same type
The foreign exchange (also known as forex or FX) market is a global marketplace for exchanging national currencies.