called churning. A store-bought butter is often  pasteurized,​​ a process of partial sterilization,  

to make the product safe for consumption  and improve its keeping quality. However,  

Bacteria can be introduced when handling butter,  causing it to spoil. The USDA recommends keeping  

butter at room temperature for no more than one  to two days. Salted butter is less likely to  

spoil at room temperature than unsalted butter,  but it is still important to compare labels  

and avoid leaving it out for more than two days.  Alright, this information is kind of meaningless,  

just check out the videos, they give  you even more meaningless information!