What is USDJ?

Could you please clarify for me what exactly USDJ is? I've heard it mentioned in the context of cryptocurrency and finance, but I'm not entirely sure of its function or purpose. Is it a type of digital token? Does it have a stable value tied to a specific currency, such as the US dollar? And how does it fit into the broader landscape of digital assets and decentralized finance? I'd appreciate any insights you could provide to help me better understand this concept.