A culture is the values and practices shared by the members of the group. Company Culture, therefore, is the shared values and practices of the company's employees. Corporate culture isn't something you can define. It's intangible: a state of mind, a feeling, a collective consciousness that's infused in a business and its employees.
Company culture is important because it can make or break your company. Companies with an adaptive culture that is aligned to their business goals routinely outperform their competitors. Some studies report the difference at 200% or more. To achieve results like this for your organization, you have to figure out what your culture is, decide what it should be, and move everyone toward the desired culture.