الحضور مهم.

Here, الحضور means attendance or presence.

A learner might first think it refers to the audience or the attendees, and it can sometimes do that in other contexts. But in this sentence, it most naturally means the abstract idea of being present / attendance.

So:

• الحضور مهم = Attendance is important / Being present is important

In Arabic, the present tense often does not use a separate word for is / am / are.

So:

• الحضور مهم literally looks like attendance important
• but the natural English meaning is Attendance is important

This is a very common pattern in Arabic nominal sentences.

This is a nominal sentence in Arabic, called جملة اسمية.

It has two main parts:

• الحضور — the subject/topic
• مهم — the predicate/comment

So the structure is:

• الحضور = attendance
• مهم = important

Together: Attendance is important.

Because الحضور is the subject and is definite here: the attendance or, more naturally in English, just attendance as a general concept.

The word مهم is an adjective functioning as the predicate, and in this kind of sentence it is usually indefinite, so it does not take الـ.

Compare:

• الحضور مهم = Attendance is important
• الحضور المهِم would mean something more like the important attendance/presence, which is a different structure

So مهم here is not directly describing a noun inside a noun phrase; it is completing the sentence as the predicate.

Because الحضور is grammatically masculine.

In Arabic, adjectives and predicates usually agree with the noun in gender and number. Since الحضور is masculine singular, the predicate is also masculine singular:

• الحضور مهم

If the subject were a feminine noun, you would usually expect a feminine form, such as مهمة if appropriate.

A careful pronunciation is:

• al-ḥuḍūru muhimmun with full case endings
• In normal pause: al-ḥuḍūr muhim

A few pronunciation notes:

• ح is a strong breathy h, not the ordinary English h
• ض is an emphatic consonant, deeper/heavier than English sounds
• و in حضور gives a long ū sound: ḥu-ḍūr
• مهم is usually pronounced muhimm or muhim depending on how fully you pronounce it

In everyday learning materials without full endings, learners often say:

• al-ḥuḍūr muhim

الحضور comes from the root ح ض ر, which has to do with being present, attending, or presence.

Related words include:

• حضر = he attended / he was present
• يحضر = he attends / he is present
• حضور = attendance / presence
• حاضر = present
• محاضرة = lecture (historically related through the idea of being present / addressing an audience)

This is useful because Arabic vocabulary often becomes easier to remember when you notice word families built from the same root.

Grammatically, الحضور here is singular, but it is an abstract verbal noun rather than a simple countable noun.

That means it refers to the general idea of attendance/presence, not to one attendee or many attendees.

So even though the meaning may involve many people being present, the word itself is treated as a singular abstract noun in this sentence.

Yes, in some contexts الحضور can refer to those present, the attendees, or the audience.

So depending on context, الحضور مهم could also be understood as:

• The attendees are important
• The audience is important

However, if this sentence appears by itself in a beginner lesson, the most likely meaning is the abstract one:

• Attendance is important
• Being present is important

Context decides which meaning is intended.

Yes. Both مهم and هام can mean important.

So both are possible:

• الحضور مهم
• الحضور هام

In many modern contexts, مهم is more common and very natural for learners to use.

In fully vocalized formal Arabic, the sentence would typically be:

• الحضورُ مهمٌّ

Why?

• الحضورُ has ـُ because it is the subject of a nominal sentence
• مهمٌّ has ـٌ because it is an indefinite predicate

But in normal written Arabic, these endings are usually omitted, so you will usually just see:

• الحضور مهم

Because it is agreeing with الحضور, which is grammatically masculine.

• masculine: مهم
• feminine: مهمة

Since الحضور is masculine, the correct form here is:

• الحضور مهم

If the subject were a feminine noun, then مهمة might be needed.

Yes. That is a very good observation.

Because الحضور is an abstract noun, English can translate it in different natural ways:

• Attendance is important
• Being present is important
• Presence is important

Which one sounds best depends on context:

• school/work context: Attendance is important
• general advice: Being present is important
• formal/abstract style: Presence is important