I recently published a book called the “IBM Data Governance Unified Process.” As I state on the back cover, Data Governance can be like the blind men and the elephant. Depending on which part of the elephant you touch, you will equate Data Governance with one or more of metadata, business glossaries, master data governance, analytics governance, security and privacy, and information life-cycle governance.
All these definitions are correct, but they are incomplete. Data Governance is about setting policy around data to treat is as an enterprise asset. Your enterprise needs to protect, leverage, and optimize its data in much the same way as it would any tangible asset such as a building or equipment.
The book walks through a series of 14 steps and 93 sub-steps to implement a Data Governance program.