From corporate governance… 

The corporate governance concept was born just after the economic crash of 1929.  However corporate governance as we know today only appeared at the mid-1990.
The corporate governance is a set of processes, regulations, laws, and institutions that have an important influence on the way that the company is managed, administered and controlled. It involves a set of links between the different stakeholders of the organization. Furthermore the whole decision-making process (shareholders, board members and the CEO) is influenced by governance.
To summarize, corporate governance is about how companies make decisions, how they organize themselves and how they communicate with shareholders and the rest of the world.

…To corporate governance and CSR

The corporate governance has changed. Now, it is not enough to control how companies make decisions, how they organize themselves and how they communicate with shareholders and the rest of the world. For many companies the corporate social responsibility is a way to better engage with many of their stakeholders, including investors and consumers. Corporate governance and CSR are resulting into formalization and definition of ethical policy, a better oversight of safety principles, setting up risk management program, and many other policies.
The Corporate Social Responsibility is a way for organizations to improve clearly corporate governance processes.