The Irish currency in the Republic of Ireland is the euro. The symbol for the currency is EUR.
As with many other currencies around the world, the euro comprises 100 cents. Euro notes come in seven denominations. These are 5, 10, 20, 50, 100, 200, and 500 euro notes. Euro coins come in eight denominations. Some euro coin denominations are euro cents and some of them are full euros.
The euro cent coins come in denominations of 1, 2, 5, 10, 20, and 50 cents. The full euro coins come in denominations of 1 and 2 euros.
Note that the Irish currency in Northern Ireland is the British pound (GBP), not the euro. If you are travelling from the Republic of Ireland to Northern Ireland, you will need to change money or go to a cash machine when you arrive.