Segal extensions and Segal algebras in uniform Banach algebras

Segal extensions, not necessarily injective, of a Banach algebra into a Banach algebra are discussed resulting into answering when do the Gelfand map of a commutative Banach algebra as well as Gelfand-Naimark construction on a, not necessarily commutative, Banach $$*$$ -algebra give Segal extensions. Analogous to $$C^*$$ -Segal algebras arising from Segal extension into $$C^*$$ - algebras, uB-Segal algebras arising from Segal extensions into uniform Banach algebras are intrinsically characterized.