What is trading fee in BingX?

Excuse me, could you please elaborate on what exactly is meant by "trading fee" in the context of BingX? Is it a commission charged by BingX for facilitating trades on their platform? If so, how is this fee calculated and what factors influence its amount? Additionally, are there any discounts or promotions available for users to reduce their trading fees on BingX? Understanding the specifics of trading fees is crucial for traders to make informed decisions and manage their costs effectively.