Gender norms or gender role is a societal construct which dictates how an individual should behave based on their assigned sex at birth. It promotes the idea that gender is binary and the same as biological sex. It dictates how an individual should speak, act, dress, behave and conduct themselves in the society.
Sources: https://www.unicef.org/media/65381/file/GP-2020-Technical-Note-Gender-Norms.pdf