هذا اشتراك.

In Modern Standard Arabic, a simple present-tense sentence like this usually does not use a separate word for is.

So:

• هذا اشتراك = This is a subscription

This type of sentence is called a nominal sentence. Arabic often just places the two parts side by side.

If you wanted a past-tense version, you would use a verb such as كان:

• كان هذا اشتراكًا = This was a subscription

Because اشتراك is a masculine singular noun.

• هذا = this for masculine singular
• هذه = this for feminine singular

So:

• هذا اشتراك is correct
• هذه اشتراك is not correct in standard grammar

If the noun were feminine, you would use هذه instead.

Because it does not have the definite article الـ.

• اشتراك = a subscription / subscription
• الاشتراك = the subscription

Arabic does not have a separate word for a/an. Indefiniteness is usually shown by the absence of الـ, and in fully vocalized text also by tanwīn.

So the sentence means This is a subscription, not This is the subscription.

In fully vocalized MSA, yes. You would normally write:

• هذا اشتراكٌ

The final ـٌ is tanwīn ḍamm, showing that اشتراك is indefinite nominative.

That happens because it is the predicate of the sentence.

However, in normal Arabic writing, short vowels and tanwīn are usually omitted, so you will commonly see:

• هذا اشتراك

Also, when stopping at the end of the sentence, Arabic usually drops the spoken tanwīn, so a speaker may say:

• hādhā ishtirāk

rather than fully pronouncing ishtirākun.

A careful full pronunciation is:

• hādhā ishtirākun

In pause, more commonly:

• hādhā ishtirāk

A few pronunciation notes:

• هذا = hādhā
• ذ sounds like th in this
• اشتراك begins with ish-
• The long ā in -راك is important

A rough learner-friendly pronunciation is:

• HAA-dhaa ish-ti-RAAK

This is a very common learner question because هذا is a high-frequency word with slightly special spelling.

In careful orthography, it can appear as:

• هٰذا

That small mark above the ه is called dagger alif, and it shows a long ā sound.

So even when it is written in the ordinary way as هذا, it is still pronounced:

• hādhā

This is something learners usually just memorize as a whole word.

Normally, for a beginner, the safe answer is no.

In basic MSA:

• هذا + indefinite noun usually forms a full sentence
  
  • هذا اشتراك = This is a subscription

If you want to say this subscription, Arabic usually makes the noun definite:

• هذا الاشتراك = this subscription

So the presence or absence of الـ matters a lot here.

اشتراك is a verbal noun (maṣdar) from the verb اشترك.

It comes from the root:

• ش ر ك

This root has meanings connected with:

• sharing
• participation
• partnership

That is why related words include:

• شريك = partner
• شركة = company
• مشاركة = participation

In modern usage, اشتراك often means:

• subscription
• membership
• participation

The exact sense depends on context.

Because the word begins with a type of initial alif called hamzat al-waṣl.

At the beginning of an utterance, it is pronounced with a helping vowel, so you say:

• ishtirāk

That is why in this sentence you hear:

• hādhā ishtirāk

For beginners, the practical rule is simple:

• if you start the word by itself, pronounce it ish-

This is very common in words built on certain verb patterns in Arabic.

Yes. هذا اشتراك is the normal straightforward order for this meaning.

It starts with the demonstrative:

• هذا = this

and then gives the identifying noun:

• اشتراك = a subscription

So the sentence works as:

• This is a subscription

A learner should stick with this order for simple identification sentences like this.