Die volmag bly vertroulik.

Die is the definite article in Afrikaans, so here it means the.

A useful thing for English speakers to know is that Afrikaans does not change the definite article for gender or case. It is simply die for all nouns:

• die man = the man
• die vrou = the woman
• die huis = the house

It can also be used with plural nouns, so context tells you whether it is singular or plural.

It is capitalized only because it is the first word of the sentence.

In normal writing, die is not capitalized unless it starts a sentence.

Volmag is a legal or formal word. It usually means power of attorney, authorization, or proxy authority, depending on context.

So it is not an everyday noun like book or car. It belongs more to administrative or legal language.

There actually is a verb in the sentence, but it is bly, not is.

Afrikaans uses bly here as a linking verb meaning remains or stays:

• Die volmag bly vertroulik. = The power of attorney remains confidential.

So the sentence is not saying simply is confidential, but rather continues to be confidential.

Here bly means remain or stay.

That is important because bly can also mean live/reside in other sentences:

• Ek bly in Pretoria. = I live in Pretoria.
• Dit bly moeilik. = It remains difficult.

So in your sentence, bly is not about living somewhere. It is about a state continuing.

Yes, you could.

The difference is nuance:

• Die volmag is vertroulik. = The power of attorney is confidential.
• Die volmag bly vertroulik. = The power of attorney remains confidential.

So bly adds the idea of continuing to be confidential.

Because vertroulik is being used after a linking verb (bly), not directly before the noun.

In Afrikaans, adjectives often look different depending on position:

• die vertroulike volmag = the confidential power of attorney
  -> adjective before the noun, often with -e
• Die volmag is vertroulik = The power of attorney is confidential
  -> adjective after the verb, usually no -e

So in your sentence, vertroulik is the normal form.

Usually yes, in most contexts.

It means something like:

• confidential
• private
• not to be disclosed

In formal or legal contexts, confidential is usually the best translation.

Yes. This is a very normal Afrikaans main-clause pattern:

Subject + verb + complement

• Die volmag = subject
• bly = verb
• vertroulik = adjective/complement

So it works much like English:

• The power of attorney remains confidential.

No, not in the way many other European languages do.

Afrikaans does not require you to choose different articles like de/het in Dutch or der/die/das in German. You just use die as the definite article here.

That makes sentences like this simpler for learners.

A rough English-friendly guide would be:

duh VOL-makh blay fuhn-TROU-lik

A few notes:

• volmag: the g at the end is a harsher Afrikaans sound, not a soft English g
• bly sounds a bit like blay
• vertroulik has the trou part sounding a bit like trow in cow, but not exactly

If you want to sound more natural, the stress is mainly on:

• VOLmag
• verTROUlik

Yes, it sounds fairly formal because of the noun volmag.

The grammar itself is completely ordinary, but the vocabulary is more likely to appear in legal, official, or administrative contexts than in casual conversation.