Consumerism is a socio-cultural and economic phenomenon that is typical of industrialized societies. It is characterized by the continuous acquisition of goods and services in ever-increasing quantities. In contemporary consumer society, the purchase and the consumption of products have evolved beyond the mere satisfaction of basic human needs, transforming into an activity that is not only economic but also cultural, social, and even identity-forming. It emerged in Western Europe and the United States during the Industrial Revolution and became widespread around the 20th century. In economics, consumerism refers to policies that emphasize consumption. It is the consideration that the free choice of consumers should strongly inform the choice by manufacturers of what is produced and how, and therefore influence the economic organization of a society.

Consumerism has been criticized by both individuals who choose other ways of participating in the economy (i.e. choosing simple living or slow living) and environmentalists concerned about its impact on the planet. Experts often assert that consumerism has physical limits, such as growth imperative and overconsumption, which have larger impacts on the environment. This includes direct effects like overexploitation of natural resources or large amounts of waste from disposable goods and significant effects like climate change. Similarly, some research and criticism focuses on the sociological effects of consumerism, such as reinforcement of class barriers and creation of inequalities.

The term "consumerism" has several definitions. These definitions may not be related to each other and they conflict with each other.

In a 1955 speech, John Bugas, a vice president of the Ford Motor Company, coined the term "consumerism" as a substitute for "capitalism" and better describe the American economy:

The term consumerism would pin the tag where it actually belongs – on Mr. Consumer, the real boss and beneficiary of the American system. It would pull the rug right out from under our unfriendly critics who have blasted away so long and loud at capitalism.

Bugas's definition aligned with Austrian economics founder Carl Menger's conception of consumer sovereignty, as laid out in his 1871 book Principles of Economics, whereby consumer preferences, valuations, and choices control the economy entirely. This view stood in direct opposition to Karl Marx's critique of the capitalist economy as a system of exploitation.

For social critic Vance Packard, however, "consumerism" was not a positive term about consumer practices but rather a negative term, meaning excessive materialism and wastefulness. In the advertisements for his 1960 book The Waste Makers, the word "consumerism" was prominently featured in a negative way.

One sense of the term relates to efforts to support consumers' interests. By the early 1970s it had become the accepted term for the field and began to be used in these ways: