What is Zero, First, Second, and Third-Party Data?

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One of the more pronounced benefits of going into online marketing is how you can track, analyze, and understand your customers as well as how they respond to your product. All of this information is called “data,” and when you’re deep enough into collecting data while journeying into online marketing, you might have stumbled upon the terms “zero,” “first,” “second,” and “third-party” data. What exactly are they, and why do you need to know the difference?