This is the 38th most frequent Estonian word.
need
"Need" in Estonian means "these" or "them."
In this question, 'need' serves to specify certain referenced items in a plural sense, in this case, certain books.
Kas sul on need raamatud kaasas?
Do you have those books with you?
In this sentence, 'need' is used as a demonstrative pronoun referring to a group of people.
Need on minu sõbrad.
These are my friends.
Here, 'need' again functions as a demonstrative pronoun, specifically identifying a set of objects, in this case, keys.