noun
Polite form of 友達, used mainly by children or when speaking to children, and in polite adult conversation.
幼稚園で新しいお友達ができた。
I made a new friend at kindergarten.
お友達と一緒に遊びに行きます。
I'm going out to play with my friend.
noun
child (one does not know); another child; other children
Used by parents or guardians to refer to a child they don't know, or to other children in general, often in a gentle or polite tone.
公園でお友達に砂をかけられた。
Some other child threw sand at him at the park.
お友達と仲良く遊びなさい。
Play nicely with the other children.