Turkish is an agglutinative language, which means that grammatical functions are often indicated by adding suffixes to a base word. For nouns, these suffixes indicate their "case" (isim hali), which shows the noun's role in the sentence (e.g., subject, object, location).

There are six main noun cases in Turkish. Understanding them is crucial for forming grammatically correct sentences.

The Six Noun Cases:

• Nominative (Yalın Hal): The basic form, subject of the sentence.
• Accusative (Belirtme Hali -i): The definite direct object.
• Dative (Yönelme Hali -e): Indicates direction 'to' or an indirect object.
• Locative (Bulunma Hali -de): Indicates location 'in', 'on', or 'at'.
• Ablative (Ayrılma Hali -den): Indicates origin 'from', or comparison 'than'.
• Genitive (Tamlayan Hali -in): Indicates possession 'of'.

Each of these cases will be explained in detail in its own sub-topic. The choice of suffix for each case depends on vowel harmony and sometimes consonant assimilation.