What is the usecase of supplier association with item creation process?

Summary:

Basically want to know in brief that what is the purpose of supplier association with item creation process, what value does it add and which areas would be impacted if not it is not filled.

I have read that it most probably for the reference purpose. But still want to recheck.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

24B

Code Snippet (add any code snippets that support your topic, if applicable):