What is LUSD?

Could you please elaborate on what exactly LUSD is? Is it a new type of cryptocurrency or a token? What sets it apart from other digital assets in the market? And what are its potential use cases and benefits for users? Additionally, how does the value of LUSD fluctuate and what factors influence its stability? Lastly, what are the risks involved in investing in LUSD and how can investors mitigate those risks?