Remonetisation

Okay, so imagine you have a piggy bank and you put all your money in it. One day, the bank people tell you that your piggy bank money is not worth anything anymore because they changed the rules about using it. This means you can't buy things with your piggy bank money like before.

But then, they tell you that they are changing the rules again, and your piggy bank money is worth something again! Yay! This is what remonetisation means. It is the process of re-introducing and re-establishing a currency as a valid and usable form of money by updating or changing the rules about how it can be used.

Just like how your piggy bank money can be used to buy things again after the rules changed, when a country undergoes remonetisation, the money used in that country becomes valuable and can be used to buy things again. It is like giving a second life to the money that was not useful before.