circle of friends; one's relationships; people one knows
Refers to the network of people one associates with socially, including friends and acquaintances.
He has a wide circle of friends.
It's tough to build new relationships in a new place.
交友関係 narrows the focus to friendships and social circles, whereas 人間関係 covers all kinds of interpersonal ties, including family and work.
Compound of 交友 (friendship, companionship) and 関係 (relation, connection).