이다/있다 are essential Korean grammar points that help to express the existence of something or state something as a fact. 이다 is a copula that serves as the Korean equivalent of “to be” or “is” and is used to link a subject with a predicate. It is frequently found in its verb form as 이에요 or 예요. 있다 indicates existence or possession and can mean “there is,” “have,” or “exist.” Understanding these two grammar points is crucial for Korean learners to form sentences and convey their thoughts accurately in the language.