Learn Swedish: Vi tittar på foton ikväll. - We are looking at photos tonight.

Foton belongs to a group of nouns (Group 4) that get an -n in the plural. This happens with ett words that end in a vowel. The singular is ett foto (a photo), so the plural becomes foton (photos).

Why do we use på here? Doesn't it usually mean 'on'?

Yes, på often means 'on,' but Swedish uses the combination tittar på to mean 'looking at' or 'watching.' You will see this pair very often, like in tittar på tv (watching TV).

The English translation says 'are looking', but is tittar just the regular present tense?

Exactly! Swedish doesn't have a separate 'is/are doing' form (present continuous). Vi tittar can mean both 'we look' and 'we are looking,' depending on the context.

How does the word ikväll work?

Ikväll means 'tonight' or 'this evening.' It is made up of i (in) and kväll (evening). You might also see it written as two separate words (i kväll); both are correct and mean the exact same thing!