Can I use my PI to buy things?

Excuse me, I'm curious about something. I've been hearing a lot about Personal Information, or PI, being used in various ways, including as a form of currency or payment. I'm wondering, is it actually possible to use my PI to buy things? If so, how does that work? Are there any specific platforms or services that accept PI as payment? And what kind of things can I buy with it? I'm just trying to get a better understanding of the concept and its practical applications.