CSR is an acronym which stands for "corporate social responsibility". In simple terms, this is the responsibility for a company to uphold certain social ideals and promote honest and upfront products and services while keeping their effects on society in mind.
CSR goes beyond the changes that take place at the corporate level, they also take into consideration their effects on the environment, their effects on other communities they effect and interact with locally, and how their business provides support for future generations. As such, CSR is incredibly necessary to make sure current and future corporations act in a similar manner.