What is a prepositional case?

Prepositional case is a grammatical case that marks the object of a preposition. This term can be used in languages where nouns have a declensional form that appears exclusively in combination with certain prepositions.

It is also called a dative case ... represented by dat or d ... it indicates that noun to whom something is given ... like she gave Jess a book ... here Jess is dat or prepositional case ...