For much of human history, “femininity” and “masculinity” were unknown terms. But that does not mean that the concept of gender did not exist. Indeed, many societies in recorded history had conceptions of what it means to be a gendered person—most often noted in the binary of “man” and “woman”—but these conceptions were normative and perceived as intrinsic to human behavior and culture. Masculinity and femininity were naturalized concepts, assumed to be the ways in which men and women should act, look, or communicate. In the 19th and 20th centuries, scholars and activists noted that femininity and masculinity are social constructions of a gendered society, often denoting the ways in which people, objects, and practices conform to or transgress gendered expectations. Both terms are highly contingent upon the cultural, historical, and geopolitical locations in which they are used, meaning that they can only be accurately understood or defined for a given time or context; it is impossible to define either term in a universal manner. Femininity, as an articulated concept, has a longer history of being visible and enforced by communities. Masculinity, on the contrary, historically elided critique or visibility because its attributes were often the normative and prized values and characteristics of a given social context. However, feminist movements and intellectual projects have brought masculinity to light, showing the ways in which masculinity, just as much as femininity, is a learned and enforced way of viewing actions, people, and things. In communication studies, current scholarship on masculinity and femininity examine how they circulate in a globalized world, picking up new definitions and often restructuring people’s lives. Even though both terms are abstractions with shifting definitions and applications, they create the conditions for people’s sense of identity and limit or enhance their ability to engage in communicative acts. Differently stated, while abstract concepts, they have material consequences. To understand how an abstract social construction creates material consequences, communication scholars have looked at several research locations where masculinity and femininity most obviously manifest, such as leadership and authority, media representations, rhetorical style and delivery, and interpersonal communications.