Der Onlinekatalog zeigt das Medienangebot.

Der is the definite article meaning the for a masculine singular noun in the nominative case.

Here, der Onlinekatalog is the subject of the sentence, so it appears in the nominative:

• der Onlinekatalog = the online catalog

German articles change depending on:

• gender of the noun
• number (singular/plural)
• case (nominative, accusative, dative, genitive)

So der is not just random vocabulary; it tells you grammatical information.

Because the two nouns have different grammatical genders:

• Onlinekatalog is masculine → der Onlinekatalog
• Medienangebot is neuter → das Medienangebot

In German, every noun has a grammatical gender, and the article has to match it.

A very important point: grammatical gender does not always have a logical connection to real-world meaning. You usually need to learn each noun together with its article:

• der Onlinekatalog
• das Medienangebot

Here, das Medienangebot is the direct object of the verb zeigt.

The verb zeigen usually takes:

• a subject: who or what shows
• a direct object: what is shown

So in this sentence:

• Der Onlinekatalog = subject
• zeigt = verb
• das Medienangebot = direct object

For a neuter singular noun, the definite article is:

• nominative: das
• accusative: das

So the form stays the same here.

Why not the others?

• dem would be dative
• den would be masculine accusative or plural dative, so it does not fit here

Zeigt is the third-person singular present tense form of zeigen.

The subject is der Onlinekatalog, which is singular, so the verb must also be singular:

• ich zeige
• du zeigst
• er/sie/es zeigt
• wir zeigen
• ihr zeigt
• sie/Sie zeigen

Because der Onlinekatalog = it, German uses the er/sie/es verb form:

• Der Onlinekatalog zeigt ...

German main clauses usually follow the verb-second rule.

In a normal statement, the finite verb goes in position 2:

• Der Onlinekatalog | zeigt | das Medienangebot

Here:

1. Der Onlinekatalog
2. zeigt
3. das Medienangebot

This is one of the most important basic patterns in German.

Even if something else comes first, the verb still stays second. For example:

• Heute zeigt der Onlinekatalog das Medienangebot.

So the rule is really about position, not necessarily about putting the subject first.

Yes. German very often combines nouns into compound nouns.

Here:

• online
  • Katalog → Onlinekatalog

This is very common in German, especially in formal, technical, and administrative language.

Another compound in the sentence is:

• Medienangebot
  • Medien = media
  • Angebot = offer / range / selection

So German often packs meanings into one long noun instead of using several separate words.

Good question. In a compound noun, the last element usually determines the grammatical gender and whether the whole compound is treated as singular or plural.

So in:

• Medienangebot

the final part is Angebot, which is:

• neuter
• usually singular here

That means the whole compound is:

• das Medienangebot

Even though Medien is plural in form, the whole compound does not become plural because of that.

Compare:

• das Angebot = the offer / selection
• das Medienangebot = the media offering / media selection

The first part modifies the second part, but the last part controls the grammar.

Because in German, all nouns are capitalized.

So in this sentence:

• Onlinekatalog
• Medienangebot

both begin with capital letters because they are nouns.

This is a standard rule in German spelling and one of the easiest visual clues for spotting nouns in a sentence.

Yes, that is grammatically possible, but it sounds marked or stylistically different.

German allows more flexibility in word order than English because the articles help show grammatical roles:

• der Onlinekatalog = nominative subject
• das Medienangebot = accusative object

So this sentence is still understandable:

• Das Medienangebot zeigt der Onlinekatalog.

But now the object comes first, which gives it more emphasis. In neutral, everyday style, the original order is more natural:

• Der Onlinekatalog zeigt das Medienangebot.

You identify them by a combination of case marking and verb meaning.

In this sentence:

• Der Onlinekatalog is nominative → subject
• das Medienangebot is accusative → direct object

The articles help, although here das looks the same in nominative and accusative. But der strongly suggests a masculine nominative subject.

Also, semantically, it makes sense that:

• the catalog shows
• the media offering is shown

So grammar and meaning point in the same direction.

Very often, yes. Zeigen commonly means to show and usually takes a direct object:

• Er zeigt das Bild. = He shows the picture.

It can also take an indirect object when someone is shown something:

• Er zeigt mir das Bild. = He shows me the picture.

In your sentence, there is only one object:

• das Medienangebot

So this is a simple subject–verb–object sentence.

If the subject became plural, the verb and article would change too.

For example:

• Die Onlinekataloge zeigen das Medienangebot.

Changes:

• der Onlinekatalog → die Onlinekataloge
• zeigt → zeigen

If the object became plural, you would get:

• Der Onlinekatalog zeigt die Medienangebote.

Here:

• das Medienangebot → die Medienangebote

This is a useful way to see how articles and verb forms depend on number.

A helpful approximation is:

• Onlinekatalog ≈ ON-line-kata-LOG

The strongest stress is usually on:

• ON in Online
• LOG in Katalog

And:

• Medienangebot ≈ MAY-dee-en-an-ge-BOHT

The strongest stress is typically on:

• BOHT in Angebot

Pronunciation can vary a little depending on region and speaking style, but those stress patterns are a good guide for learners.