이다 and 있다 can both have a meaning of “to be” but they have very different usages. 이다 is attached to nouns to say “Is/Am/Are Noun” but 있다 is

Have you seen 입니다, 이에요, or 예요 before, but are confused about them? This is the perfect time to learn how they work. “Is/Am/Are”.. in Korean.