حماية الحساب مع مدير كلمات المرور مهمة.

It is a nominal sentence in Arabic, meaning it does not need a present-tense verb like is.

So the structure is basically:

• حماية الحساب مع مدير كلمات المرور = the topic / subject
• مهمة = the predicate / comment about it

Literally, it works like:

• Protecting the account with a password manager — important.

In natural English, we add is:

• Protecting the account with a password manager is important.

حماية means protection or protecting.

It is a verbal noun (called a maṣdar), related to the verb حَمَى / يَحْمِي = to protect.

So حماية can act like:

• protection
• the act of protecting
• protecting

In this sentence, it is being used like protecting or protection of.

Because حماية الحساب is a construct phrase (called iḍāfa).

In an iḍāfa:

• the first noun usually does not take الـ
• the second noun can make the whole phrase definite

So:

• حماية الحساب = protection of the account / account protection

Here:

• حماية = protection
• الحساب = the account

Since الحساب is definite, the whole phrase becomes definite in meaning.

Yes. Literally, حماية الحساب means:

• protection of the account

That is a very common Arabic structure: noun + noun, where English might use of or sometimes turn it into an -ing phrase.

So depending on context, you could translate it as:

• protection of the account
• account protection
• protecting the account

All are reasonable ways to understand it.

مع usually means with.

In this sentence, it gives the idea of doing something with the help of or using something:

• مع مدير كلمات المرور = with a password manager

So the sentence means that the account is being protected with a password manager.

That said, if you want to make the idea of using clearer, Arabic often uses:

• باستخدام مدير كلمات المرور = by using a password manager

So مع is understandable here, but باستخدام can sound more explicit.

Literally, it means:

• manager of password words

But that literal breakdown is just how Arabic builds the expression. In normal English, it means:

• password manager

This is another iḍāfa structure:

• مدير = manager
• كلمات المرور = passwords

So:

• مدير كلمات المرور = password manager

Because Arabic often stacks nouns using iḍāfa instead of using prepositions like of repeatedly.

Here the structure is:

• مدير = manager
• كلمات المرور = passwords

And inside كلمات المرور, there is another iḍāfa:

• كلمات = words
• المرور = passage / passing

So literally:

• كلمات المرور = words of passage = passwords
• مدير كلمات المرور = manager of passwords = password manager

This kind of nested noun structure is very common in Arabic.

Because Arabic is expressing the idea as a manager for passwords in general.

So:

• كلمة المرور = password
• كلمات المرور = passwords

Then:

• مدير كلمات المرور = a manager of passwords = a password manager

Even though English uses singular password in password manager, Arabic naturally uses the plural here because the tool manages multiple passwords.

Because it agrees with حماية, which is a feminine noun.

In Arabic, adjectives and predicate adjectives normally agree with the noun in:

• gender
• number
• definiteness, if they are directly modifying it

Here, مهمة is feminine singular because حماية is feminine singular.

So:

• حماية = feminine singular
• مهمة = feminine singular

That is why you do not get مهم here.

Because مهمة here is the predicate of the sentence, not an adjective directly attached inside the noun phrase.

Arabic often leaves the predicate indefinite in sentences like this.

So:

• حماية الحساب مع مدير كلمات المرور مهمة
  = Protecting the account with a password manager is important

Here, مهمة means important as the statement being made about the subject.

If it were an adjective directly modifying a definite noun phrase, then you would expect definiteness matching. But here it is not the important account protection; it is saying that the whole idea is important.

It is simply not stated in the present tense.

In Arabic, present-tense nominal sentences usually do not use a word for is / are.

So:

• الكتاب جديد = The book is new
• حماية الحساب مع مدير كلمات المرور مهمة = Protecting the account with a password manager is important

If you wanted was, will be, and so on, Arabic would use extra words or verbs. But for simple present is, Arabic normally leaves it out.

A fully vocalized version would be:

حِمايةُ الحِسابِ معَ مُديرِ كَلِماتِ المُرورِ مُهِمَّةٌ

Those endings reflect the grammar:

• حِمايةُ = nominative, because it is the subject/topic
• الحِسابِ = genitive, because it is the second term of the iḍāfa
• معَ = preposition
• مُديرِ = genitive after مع
• كَلِماتِ = genitive as part of iḍāfa
• المُرورِ = genitive as part of iḍāfa
• مُهِمَّةٌ = nominative predicate

A helpful transliteration is:

ḥimāyatu l-ḥisābi maʿa mudīri kalimāti l-murūri muhimmah

It is understandable and grammatical, but many learners will also hear or use:

• حماية الحساب باستخدام مدير كلمات المرور مهمة
• Protecting the account by using a password manager is important

Using باستخدام can sound a little more explicit when you mean by using rather than simply with.

So:

• مع مدير كلمات المرور = with a password manager
• باستخدام مدير كلمات المرور = by using a password manager

Both work, but باستخدام often makes the intended meaning clearer in this kind of tech/security sentence.