Why do you need to know the exchange rate?

There are different states that issue their money, so there are different currencies.

There are different states that issue their money, so there are different currencies. If the means of payment were only silver or gold, as in past centuries, then the currency would differ only in form, weight and the image printed on it. But the money is completely different and therefore the exchange rates on the site depend on international trade and politics.
Quotations of currencies are determined as well as the value of the goods – supply and demand. In addition to the key factors that contribute to the formation of demand for currency, they suggest how to be guided in choosing a currency for different purposes.

The foreign exchange market and the securities market are different in that the currency market does not have a common means of payment for all. Selling or buying a currency is just an exchange of money from one country to another.
In order to preserve their savings and protect them from inflation, individuals buy currency that they consider more reliable. Her choice is determined by trust. That is, people get rid of the currency that they consider unstable and buy one that has a stable rate.
The exchange rate is used in international payments. Thanks to this, you can easily determine how much you need to pay for the goods in national currency. The currency quotation of countries is set by the Central Bank. At the exchange rate and calculate the import and export operations, as well as foreign investment in national currency. Once again, it should be noted that in the modern market, the exchange rate is formed according to supply of demand.