The Eurovision Song Contest has a complex voting system that has been changed regularly over the years.
Last year, a rule was introduced that viewers around the world could vote for 24 hours before the Grand Final but not post-broadcast.
In 2023, people from countries outside the contest were able to vote online and on the app for the first time in the competition's nearly seven-decade history.
Their votes are converted into points. These points have the same weight as one participating country.
Grand Final voting is also open before the first song is performed, and 25 to 40 minutes after the final act has finished.
Here is how it works:
The 69th edition of the Eurovision Song Contest starts with the two semi finals on Tuesday 13 and Thursday 15 May, which Ireland will perform in.
Ten songs from each semi-final will qualify for the grand final. They will join last year's winning country, Switzerland, along with the Big Five (France, Germany, Italy, Spain and the United Kingdom) for a total of 26 songs.
The qualifiers are determined purely by a public vote. Participating countries vote in the semi-final their country is performing in.
Fans from all participating countries can vote over the phone, by text or via the Eurovision app but people are unable to select their own country's entry.
The public votes make up 50% of the total vote, with the other half determined by a professional jury in each participating country.
After viewers have cast their votes, a national spokesperson from each of the participating countries will present the points of their professional jury – which range from the maximum "douze points" (12) to one point.
After the presentation of the scores from the juries, the public points from all participating countries will be combined, providing one score for each song.
The country at the top of the scoreboard becomes the 2025 winner and in the event of a tie it will be decided through the highest scores from the audiences and the non-participating countries.
The first Eurovision Song Contest Semi-Final will be broadcast live on RTÉ2 and RTÉ Player at 8pm on Tuesday, 13 May. The second semi-final will be aired on RTÉ2 and RTÉ Player at 8pm on Thursday, 15 May.
The Eurovision Song Contest Grand Final takes place on Saturday, 17 May and you can catch it live on RTÉ One and RTÉ Player.
Read more: Everything you need to know about Eurovision 2025
