Exchange rate regime is like a game where different countries use different rules to play. Just like how in some games you have to follow specific rules to win, in exchange rate regime, countries follow certain rules to determine the value of their currency.
Imagine you have a toy car that you want to trade with your friend's toy bear. The exchange rate between the two toys would be how many cars your friend is willing to give you in exchange for the bear.
Some countries play the exchange rate game by letting other countries decide the value of their currency. This could be like letting someone else decide how many cars your toy bear is worth. These countries have a floating exchange rate regime.
On the other hand, some countries have a fixed exchange rate regime. This means they decide the value of their currency and stick with it. It is like deciding that your toy bear is worth two cars and you won't change your mind even if your friend wants to give you more cars.
Then there are countries with a hybrid exchange rate regime. They follow some rules of a fixed exchange rate regime and some rules of a floating exchange rate regime. This could be like deciding that your toy bear is worth at least two cars but it can increase or decrease depending on the demand for the bear.
Different countries have different exchange rate regimes because it helps them control their economy and trade. It can be confusing, but exchange rate regime is just like a game with different ways of determining the value of currency.