der
the
Definite article that accompanies a masculine noun in the singular nominative.
Der Hund bellt.
The dog barks.

the
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the
Definite article that accompanies a masculine noun in the singular nominative.
Der Hund bellt.
The dog barks.

You can tell whether 'der' (the/who) is an article or a relative pronoun from the sentence structure. As a relative pronoun, it introduces a subordinate clause, and the conjugated verb comes at the end of that subordinate clause.
Der Mann, der dort steht, ist mein Bruder.
The man who is standing there is my brother.
As a demonstrative pronoun, 'der' (that one/he) is strongly stressed and can stand alone to refer to a person or thing. As an unstressed article, it always stands directly before its noun or an adjective.
Wer hat das Glas zerbrochen? – Der da war's!
Who broke the glass? – That guy did it!
Although 'der' (the) is the masculine article for the nominative, it is also used for feminine nouns when they are in the dative or genitive.
Er hilft der alten Dame über die Straße.
He helps the old lady across the street.
When 'der' (who/that) introduces a relative clause, the conjugated verb always comes at the end of the clause that begins with 'der'.
Ich kenne den Jungen, der jeden Morgen die Zeitung bringt.
I know the boy who delivers the newspaper every morning.
In the genitive plural, the article 'der' (of the) is always used, regardless of the gender of the nouns in the singular.
Die Entscheidung der Politiker wurde kritisiert.
The politicians' decision was criticized.
As a demonstrative pronoun, 'der' (that one/he) is often used in spoken language to point to a person or identify them.
Schau mal, der hat ja rote Haare!
Look, that guy has red hair!
the
'der' and 'die' are both among the most common forms in German. Both can be articles, relative pronouns, or demonstrative pronouns. The most important difference is grammatical gender, number, and case. For example, 'der' fits a masculine noun in the nominative: 'der Mann' (the man). 'die' fits a feminine noun or nouns in the plural: 'die Frau' (the woman), 'die Kinder' (the children). Learners easily confuse the forms because both occur very often, and 'der' can also be used with feminine nouns in the dative or genitive. That is why you always have to pay attention to the noun, case, and number.

Der Bus kommt am Abend später als sonst.
The bus comes later than usual in the evening.
Nach dem Gespräch sucht meine Freundin die Kollegin auf der Feier.
After the conversation, my friend looks for the colleague at the party.