This is the 1555th most frequent Arabic word.
للأطفال
"For children."
Here, 'للأطفال' is used as an indirect object indicating who the book is beneficial for.
الكتاب مفيد للأطفال.
The book is beneficial for children.
The phrase 'للأطفال' designates the target audience—the park is specifically intended for children.
يوجد متنزه جديد للأطفال في الحي.
There is a new park for children in the neighborhood.
In this sentence, 'للأطفال' explains the recipients of the gifts.