Declarative Sentence:
* Purpose: To state a fact or opinion.
* Structure: Typically subject-verb-object or subject-verb-complement.
* Examples:
* The sun is shining.
* She loves cats.
* I am hungry.
Interrogative Sentence:
* Purpose: To ask a question.
* Structure:
* Often starts with a question word (who, what, where, when, why, how) or an auxiliary verb (do, does, did, etc.).
* Usually ends with a question mark.
* Examples:
* What is your name?
* Where are you going?
* Did you finish your homework?
In short: Declarative sentences tell you something, while interrogative sentences ask for information.