The German genitive case is used to either indicate possession, or ownership. However, in spoken German the genitive is often regarded as old-fashioned and too formal. A more common way to replace it is by using the preposition 'von' + dative.
One very important thing you should know about genitive, is that it's different than English when it comes to word order. Whereas in English the genitive construction comes first, in German it usually follows the noun it refers to. An example would better illustrate it:
Out of all four German cases, the genitive case has the most endings, both associated with words linked with the noun, and with the noun itself. These endings replace the apostrophe 's' used in the English language (even when referring to a person by name).
|Endings in the Genitive case|
|Definite Articles||des Mannes||der Frau||des Kindes||der Tiere|
|Indefinite Articles||eines Mannes||einer Frau||eines Kindes||- Tiere|
|Negative Articles||keines Mannes||keiner Frau||keines Kindes||keiner Tiere|
|Possessive Articles||meines Mannes||meiner Frau||meines Kindes||meiner Tiere|
Note that in Genitive, masculine ane neuter nouns take either an '-es' ending or a '-s' ending (usually with nouns having two or more syllables).
Certain prepositions always take the genitive case no matter their position in the sentence, and even if there will be more than one genitive noun within the sentence.
Here are a few example sentences in which the genitive nouns are pointed out: