What is a Public IP address?
Your Public IP (Internet Protocol) is a unique address assigned by your Internet Service Provider (ISP). It's like your router's "mailing address" on the web. This address is visible to websites you visit so they know where to send the information you request (such as the text and images on this page).
Why does technical support ask for this data?
When you have problems with a website or a video game, developers often ask you for your "User Agent" (Browser and Operating System) and your screen resolution. With this information, they can recreate your environment and find the exact error you're experiencing (for example, a button not visible on small screens or a bug unique to Safari).