An OEM is an acronym for Original Equipment Manufacturers. This refers to to the company that makes or produce a particular product. 

A written guarantee, issued to the purchaser of an article by its manufacturer, promising to repair or replace it if necessary within a specified period of time.

MPN stands for Manufacturer Part Number. It is a unique number that is issued by manufacturers to identify individual products. Normally, the MPN of a product is a series of numbers and letters.

Support services are processes that professionals use to execute a core program or function that generates revenue. 

A serial number (SN) is a unique identifier assigned incrementally or sequentially to an item, to uniquely identify it.

Serial numbers are alphanumeric. They may contain letters and numbers. 

A rack server or rack-mounted server, is any server that is built specifically to be mounted within a server rack.