Organizational Structure can be defined as the formal and informal framework of policies and rules, within which an organization arranges its lines of authority and communications, and allocates rights and duties. Organizational structure determines the manner and extent to which roles, power, and responsibilities are delegated, controlled, and coordinated, and how information flows between levels of management. This structure depends entirely on the organization's objectives and the strategy chosen to achieve them. In a centralized structure, the decision making power is concentrated in the top layer of the management and tight control is exercised over departments and divisions. In a decentralized structure, the decision making power is distributed and the departments and divisions have varying degrees of autonomy. An organization chart illustrates the organizational structure .
An example of organizational Structure as shown:
Fig 1.1 
Organizational culture is an idea in the field of Organizational studies and management which describes the psychology, attitudes, experiences, beliefs and values (personal and cultural values) of an organization. It has been defined as "the specific collection of values and norms that are shared by people and groups in an organization and that control the way they interact with each other and with stakeholders outside the organization."
This definition continues to explain organizational values also known as "beliefs and ideas about what kinds of goals members of an organization should pursue and ideas about the appropriate kinds or standards of behaviour organizational members should use to achieve these goals. From organizational values develop organizational norms, guidelines or expectations that prescribe appropriate kinds of behaviour by employees in particular situations and control the behaviour of organizational members towards one another."
Organizational culture is not the same as corporate culture. It is wider and deeper concepts, something that an organization 'is' rather than what it 'has'.