They commonly advertise moisturizing, hydrating and nourishing effects, plus strengthening, improved elasticity to reduce breakage, added shine and softening or detangling.
Many listings state suitability for all hair types; a subset specifically targets dry or normal hair while still including all-type claims.
They focus on damage repair (split ends, weakness, roughness, dullness, dehydration) and improving elasticity to reduce breakage, while also adding moisture, shine, smoothness and manageability.