Does KYC need SSN?

I'm curious about the requirements for Know Your Customer (KYC) verification in the world of cryptocurrency. One aspect that often comes up is the use of Social Security Numbers (SSN). So, I have to ask, does KYC necessarily require the submission of an SSN? Or are there alternative methods that can be used to satisfy KYC requirements without divulging such sensitive personal information? I'm interested in understanding the specifics of this process and how it varies from platform to platform.