Is busd backed by USD?

I'm curious to understand the fundamentals behind BUSD. Is it true that BUSD is backed by the US Dollar? If so, how does this mechanism work? Does it mean that every BUSD token in circulation is directly tied to a corresponding US Dollar held in reserve? Can you elaborate on the level of transparency and security measures in place to ensure that this backing is reliable and trustworthy? Additionally, what are the benefits for investors who choose to hold BUSD as opposed to other stablecoins or traditional fiat currencies?