What is 5000 V-Bucks?

Could you please explain what exactly is meant by "5000 V-Bucks"? Are they a form of digital currency? If so, in what context are they used? Are they tied to a specific platform or game? And what value or purchasing power do they hold? Additionally, how do individuals typically acquire V-Bucks, and what can they be used for? I'm interested in understanding the concept and significance of 5000 V-Bucks in more detail.