No. 56 in German
dieser
"This" or "that" (demonstrative pronoun/adjective).
In a sentence
Dieser Hund ist sehr freundlich.
This dog is very friendly.
The word 'dieser' is used here as a demonstrative pronoun to specify which dog is being referred to.
Ich habe diesen Kuchen selbst gebacken.
I baked this cake myself.
'Diesen' serves as an accusative demonstrative pronoun modifying the direct object 'Kuchen'.
Mit dieser Idee können wir das Problem lösen.
With this idea, we can solve the problem.
'Dieser' in the dative case is being used to specify the noun 'Idee' which is related to the preposition 'mit'.
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