Does a sole proprietor need an EIN?

I understand that being a sole proprietor often comes with the need to navigate various business and financial matters. In that regard, I have a question: Does a sole proprietor truly need an EIN, or Employer Identification Number? Is it mandatory for them to obtain one, or are there certain circumstances where it's not necessary? And if an EIN is required, what are the specific benefits or advantages that a sole proprietor can gain from having one? It's important to clarify these points to ensure that sole proprietors are making informed decisions when it comes to their business and financial operations.