Kue manis ini buat adik perempuan saya.

In Indonesian, adjectives usually come after the noun they describe.

So:

• kue manis = sweet cake
• literally: cake sweet

This is normal Indonesian word order.

In Indonesian, demonstratives like ini (this) and itu (that) usually come after the noun phrase.

So:

• kue ini = this cake
• kue manis ini = this sweet cake

The whole noun phrase comes first, and ini is added at the end.

Here, buat means for.

So buat adik perempuan saya means for my younger sister.

In everyday Indonesian, buat is a very common, informal-to-neutral alternative to untuk.

• buat = for
• untuk = for

In this sentence, buat does not mean make. It means for because of how it is used in the sentence.

Yes, from an English point of view, you can think of is as being understood.

Indonesian often leaves out the verb to be in simple sentences like this.

So:

• Kue manis ini buat adik perempuan saya.
• literally: This sweet cake for my younger sister.
• natural English: This sweet cake is for my younger sister.

This is completely normal in Indonesian.

Break it down like this:

• adik = younger sibling
• perempuan = female
• saya = I / me / my

So:

• adik perempuan = younger sister
• adik perempuan saya = my younger sister

The word adik by itself does not mean specifically sister. It means a younger sibling. Adding perempuan makes it clearly female.

Because possession in Indonesian is usually shown by putting the possessor after the noun.

So:

• adik perempuan saya = my younger sister
• literally: younger sister my

This is the normal Indonesian pattern:

• buku saya = my book
• rumah saya = my house
• adik saya = my younger sibling

Yes. You could say:

• Kue manis ini untuk adik perempuan saya.

That means the same thing.

The difference is mainly style:

• buat = very common in speech, casual/neutral
• untuk = a bit more formal or standard

Both are correct here.

Not exactly. Adik means younger sibling, not necessarily little in size or age in the English emotional sense.

So adik perempuan saya is best understood as:

• my younger sister

If you want older sister, Indonesian uses:

• kakak perempuan = older sister

So the age relationship matters: adik = younger, kakak = older.

Yes, if the context already makes the gender clear.

• adik saya = my younger sibling / my younger brother / my younger sister
• adik perempuan saya = my younger sister

Indonesian often leaves gender unspecified unless it needs to be clear. Adding perempuan makes the meaning explicit.

The sentence is:

• Kue manis ini = this sweet cake
• buat adik perempuan saya = for my younger sister

So the structure is basically:

[noun phrase] + [for phrase]

Or more literally:

this sweet cake + for my younger sister

In natural English, that becomes:

This sweet cake is for my younger sister.