Many countries require you to have an entry visa or travel permit before they let you enter the country.
Before you travel, find out if you need a visa for your trip. You can:
You should also check with them how long your passport must be valid for and if there are any other entry requirements you need to consider before you travel.
You may be able to get your visa at the point of entry of a country (airport, land border, sea port) or by applying online, but in most cases you will have to apply to the country's Embassy or Consulate in Ireland.
Each country will have its own processing time for visas. Check with the country's Embassy or Consulate to see how long in advance of travelling you need to apply for your visa.
Each country sets its own visa fees. Check with the country's Embassy or Consulate for the most up to date fees.
Some countries require you to carry identification with you at all times, including proof of your immigration status in the country.
Check the travel advice for the country you are going to or check locally when you arrive.
Make photocopies or electronic copies of your important travel documents (such as your passport and visa) and keep the originals in a safe place.
The Irish and US governments have visa agreements in place that allow their citizens to work and travel in each other's countries.