This is the 215th most frequent Polish word.
te
"Te" in Polish means "these."
In this sentence, 'te' is used as a demonstrative pronoun to point to a specific group of children.
Te dzieci są bardzo radosne.
These children are very cheerful.
Here, 'te' is used as a determiner to specify which apples the speaker is referring to.
Zjem te jabłka, które mi przyniosłeś.
I will eat these apples that you brought me.
In this instance, 'te' acts as a modifier to indicate particular days that hold special meaning to the speaker.