Complex-Type Glycoengineering is a glycoengineering approach that specifically targets the modification and optimization of complex-type N-glycosylation pathways in recombinant protein production, distinguished from other glycoengineering strategies by its focus on structurally intricate, branched oligosaccharide moieties containing multiple N-acetylglucosamine and galactose residues synthesized through the action of specific glycosyltransferases in the Golgi apparatus.