Popular culture (commonly known as pop culture) is the totality of ideas, perspectives, attitudes, memes, images and other phenomena that are deemed preferred per an informal consensus within the mainstream of a given culture, specifically Western culture of the early to mid 20th century and the emerging global mainstream of the late 20th to 21st century. Heavily influenced by mass media, this collection of ideas permeates the everyday lives of the society. By contrast, folklore refers to the cultural mainstream of more local or pre-industrial societies.

Popular culture is often viewed as being trivial and "dumbed-down" in order to find consensual acceptance throughout the mainstream. As a result, it comes under heavy criticism from various scientific and non-mainstream sources (most notably religious groups and countercultural groups) which deem it superficial, consumerist, sensationalist, and corrupted.

The term "popular culture" itself is of 19th century coinage, in original usage referring to the education and "culturedness" of the lower classes. The term began to assume the meaning of a culture of the lower classes separate from and opposed to "true education" towards the end of the century, a usage that became established by the interbellum period. The current meaning of the term, culture for mass consumption, especially originating in the United States, is established by the end of World War II. The abbreviated form "pop culture" dates to the 1960s.