Children
Child, School Children
noun
The child who is a juvenile is just a child. A group of them is children.
児童 refers specifically to children who are of elementary school age, typically from around 6 to 12 years old. It's often used in formal contexts, like in legal documents or when referring to school children in educational settings.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
私の姉は、児童相談所で働いています。
My sister works at a children's welfare center.
ハリー・ポッターって、児童書じゃないの？てっきり児童向けの本だと思っていたよ。
Isn't Harry Potter a children's book? I always thought it was a book aimed at children.
最近、授業中に立ち歩く児童生徒が増えています。
Recently, there has been an increase in the number of students wandering about during class.
児童の九割が欠席しました。
Ninety percent of the children were absent.