  This study focuses on Concave mappings, a class of univalent functions that
exhibit a unique property: they map the unit disk onto a domain whose
complement is convex. The main objective of this work is to characterize these
mappings in terms of the real part of the expression $1 +zf''(z)/f'(z)$,
considering scenarios where the omitted convex domain is either bounded or
unbounded. In the case of a bounded convex domain, we investigate the pivotal
role played by the Schwarzian derivative and the order of the functions in
understanding the behavior and properties of these mappings.
