Culture is the “internal identity” of the company or organization. We like the definition of culture given by Edgar Schein, a pioneer in the field. Schein says culture is the set of, “shared, taken-for-granted implicit assumptions that a group holds and that determines how it perceives, thinks about and reacts to its various environments.”
Put another way, Culture is the collection of unique human attitudes and behaviors that animate the shared actions of the organization – both internal and external.
 Edgar H. Schein, “Culture: The Missing Concept in Organization Studies,” Administrative Science Quarterly 41, (1996): 236.