Delignification technologies comprise the physical, chemical, physicochemical, biological, or integrated process methods used to remove, redistribute, solubilize, or structurally modify lignin within lignocellulosic materials, particularly wood and other plant cell walls. Their defining objective is to reduce the covalent and physical associations between lignin and the carbohydrate fractions—cellulose and hemicellulose—while altering biomass porosity, surface accessibility, and lignin–carbohydrate interactions ^[1]. The term includes operations such as alkaline, acidic, organosolv, oxidative, ionic-liquid, steam-explosion, mechanical, fungal, and enzymatic treatments when these processes produce measurable lignin separation or deconstruction ^[2][3][4]. Delignification is therefore broader than simple extraction: a process may qualify even when lignin is only partially removed, redistributed, depolymerized, or chemically transformed. It is distinct from cellulose hydrolysis or general biomass size reduction, although these operations may be combined with delignification in multistage pretreatment systems ^[1][2]. The resulting lignin-rich and carbohydrate-rich fractions may differ in composition and structure from the original wood, depending on the treatment chemistry and process conditions ^[3][4].