The purpose of this article is to help differentiate a Kit vs an Assembly.
Kits combine two or more items together to sell to a customer. Think of a Kit as a box to hold multiple items. The kit (box) is itself not an item and adds no value.
Assemblies are used when you take multiple items and combine them to make a new item. An Assembly IS a new item and has added value to the separate items themselves.
Kit - You sell computer parts. On your website you sell a computer with several kit options. When a kit purchase is made you would pick and ship the items chosen by the customer.
Assembly - You sell computers on your website. On your website a customer can choose which hardware they would like in their computer. When the purchase is made you would pick the items, assemble the items producing a computer and ship that computer to a customer.