In the UK, ballots are still done with pen and paper. You put a cross in one of the labelled squares and fold the paper, then drop it into the ballot box. Also

In the UK, ballots are still done with pen and paper. You put a cross in one of the labelled squares and fold the paper, then drop it into the ballot box. Also, while the guidelines say it has to be a cross, it could be any clear mark (though best not to risk it), as soneone drew a rude symbol in a square and it was counted as a vote! (https://www.bbc.co.uk/news/magazine-32693485 https://www.bbc.co.uk/news/magazine-32693485)