What is the difference between Stsol and Sol?

Could you please clarify the distinction between Stsol and Sol for me? I'm curious to understand how they differ from each other, especially in the context of cryptocurrency and finance. Are they both digital assets? Do they serve different purposes or have unique characteristics that set them apart? Additionally, is there a notable difference in their market performance or adoption among users? It would be helpful if you could elaborate on these points to provide a clear understanding of the distinction between Stsol and Sol.