What is the difference between baby wash and baby shampoo?

Could you please clarify the distinction between baby wash and baby shampoo? I'm curious about the key differences in their composition, intended use, and potential benefits for infant skin care. As a parent, I want to ensure that I'm using the most suitable product for my baby's delicate skin. Could you elaborate on the specific features that set these two products apart and offer guidance on when to use each one?