What Crypto-Exchange Is and What Traders Do There

We all know those good old stock, foreign, commodity and other exchanges. Generally speaking, there are places, where people, which can be representatives of institutions or independent individuals, trade their financial assets. For example, if I have dollars and I want to buy euros, I go to forex market and trade them. If I have Apple stocks but I believe that their value is going to decline soon, I go to stock exchange and trade they for fiat money or other stocks.