Kortoplysningerne er private.

Because Danish normally writes noun compounds as one single word.

Here, kortoplysningerne is built like this:

• kort = card
• oplysninger = details / pieces of information
• -ne = the for plural nouns

So:

• kortoplysninger = card details
• kortoplysningerne = the card details

This is very common in Danish. Where English often uses several words, Danish often combines them into one compound noun.

-ne is the definite plural ending. It means the.

So:

• en oplysning = a detail / a piece of information
• oplysninger = details
• oplysningerne = the details

In Danish, the definite article is often attached to the end of the noun instead of being a separate word like English the.

In this sentence, kortoplysningerne means the card details, not just card details in general.

In Danish compounds, the last part is the main noun, and the earlier part describes it.

So in kortoplysningerne:

• oplysninger is the main noun
• kort tells you what kind of details they are

Here, kort means card, not map. Danish kort can mean either, but the compound makes the meaning clear from context.

So kortoplysninger means card details, not anything to do with maps.

Because card details are usually thought of as several pieces of information, not just one.

For example, card details may include things like:

• card number
• expiry date
• cardholder name
• security code

So Danish naturally uses the plural oplysninger.

If you wanted to talk about just one single item of information, you could use oplysning in the singular, but that would be less natural for the general idea of card details.

Er is the present tense of at være, which means to be.

So er can mean:

• am
• is
• are

depending on the subject.

A useful thing for English speakers to notice is that Danish verbs do not change depending on person or number the way English does.

So Danish says:

• jeg er = I am
• du er = you are
• han er = he is
• de er = they are

The form stays er.

That is why the sentence uses er, even though the natural English translation uses are.

Because the adjective agrees with a plural subject.

The subject is kortoplysningerne, which is plural, so the adjective becomes private.

Compare:

• Oplysningen er privat = The detail is private
• Oplysningerne er private = The details are private

This is a common Danish pattern with adjectives used after er:

• singular common gender: often the basic form
• singular neuter: often -t
• plural: -e

So here, plural oplysningerne leads to private.

This sentence has a very straightforward Danish main-clause word order:

• Kortoplysningerne = subject
• er = verb
• private = adjective complement

So it is basically:

Subject + verb + complement

However, Danish main clauses follow the verb-second rule, often called V2. That means the finite verb usually comes in the second position.

So if another element came first, the verb would still stay second:

• Normalt er kortoplysningerne private.

That is useful to know, even though the basic sentence here looks very similar to English.

Yes, but it means something slightly different.

• Kortoplysningerne er private = the card details are private
• Kortoplysninger er private = card details are private / card details in general are private

So the version with -ne is definite and points to specific card details, while the version without -ne is more general.

Both are grammatical, but they are not exactly the same.

The singular version would be:

Kortoplysningen er privat.

That breaks down as:

• kortoplysning = card detail
• kortoplysningen = the card detail
• privat = private

Notice that in the singular, the adjective is privat, not private.

So the contrast is:

• Kortoplysningen er privat. = The card detail is private.
• Kortoplysningerne er private. = The card details are private.