Privilege is the sociological concept that some groups of people have advantages relative to other groups. The term is commonly used in the context of social inequality, particularly with regards to race, gender, age, sexual orientation, disability and social class. Specific elements of privilege may be financial or material such as access to housing, education, and jobs, as well as others that are emotional or psychological, such as a sense of personal self-confidence and comfortableness, or having a sense of belonging or worth in society. It began as an academic concept, but has since become popular outside of academia. Substantial analysis of privilege and specific social groups has been published and has included a variety of perspectives. Some commentators have addressed limitations in the term, such as its inability to distinguish between concepts of "spared injustice" and "unjust enrichment," and its tendency to conflate disparate groups.