IT governance is just corporate governance that is focused on information technology systems. It reviews the performance and security risks of IT systems.
Why is it Important to the IT Professional?
IT governance is required by law, especially due to the Sarbanes Oxley Act and Basel II. But more than this, IT governance will show the business just how important IT is to it, as well as define key metrics with which to measure performance and whether or not IT is helping the organization achieve its goals.