A Currency Pocket is a place for you to keep your money for different purposes. That could be to keep the money for daily spendings, saving towards something special or make sure you can pay for the trip you always wanted to go on.
Your Currency pocket will be created in the base currency Euro, but
you can have your money in any different available currency as well (for Prime plan 107 currencies are available, for Standard plan - 40 currencies).
If you don't want to manage your money with several pockets, you can use the default Main Pocket for all of your spendings with Vivid.