die
the
Definite article that accompanies a feminine noun in the singular nominative or accusative.
Die Sonne scheint und ich sehe die Straße.
The sun is shining and I see the street.

the
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the
Definite article that accompanies a feminine noun in the singular nominative or accusative.
Die Sonne scheint und ich sehe die Straße.
The sun is shining and I see the street.

The article 'die' (the) has the same form in the nominative and accusative both for feminine nouns in the singular and for all nouns in the plural. You do not need to change the article in these cases.
Die Frau liest ein Buch.
The woman is reading a book.
You can tell whether 'die' (the) accompanies a noun in the singular or plural from two things: the form of the noun, for example a plural ending, and the conjugation of the verb.
Die Katze schläft.
The cat is sleeping.
When 'die' (who/that) introduces a relative clause, the conjugated verb always comes at the end of that clause. This applies when it refers to feminine nouns in the singular and to nouns in the plural.
Das ist die Frau, die mir geholfen hat.
That is the woman who helped me.
When 'die' (that one/those) is strongly stressed, it functions as a demonstrative pronoun to point to specific people or things. It can then also stand alone.
Welche Tasche möchtest du? – Ich nehme die da.
Which bag would you like? – I'll take that one there.
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.

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