Data flows across many technologies, teams, and people in today's businesses. Businesses are always growing and changing, so the way we collect and share data changes all the time too. We need to know not only who owns certain data but also what to do if that data changes. This problem is often referred to as "data drift".
Consider the scenario where a piece of data is modified at its source — what implications does this have for other systems reliant on it? How do we communicate necessary changes to stakeholders? Conversely, how do we prevent changes that could disrupt the system?