Use-case for Spare Item & Service Part

Hello,

Could anyone help me with use-cases for using "Spare Item" & "Service Part" object types within service items management application. Real industry example could really help.

Also, When "Insert spare Item on assignment" box is ticked within preferences of widget, why does it create "Service Part" as parent to "Spare item" ?

Thanks in advance!

SBOM  Servicepart Aftersales