refers to a group of people who identify with each other based on a common experience, which might include geographic or national origin, ancestry, history, cultural and social norms, religion, race, language, ideology, food, dress, or other factors.

Ethnicity

Explanation:

Ethnicity  is defined as state in which a individual belongs to certain social community in which people have similar culture, tradition or national background.

People identity each other based on similar society, language,history, norms, social practices,culture beliefs, origin, religion etc.Ethnic traits classify and organize people in an ethical group.

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an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.