CSV is an old & very popular format for storing tabular data. It has been used in the desktop as well as mainframe. It is a simple & compact format that works really well for tabular data and so is still in use today.
name,department John Doe,Engineering Jane Doe,Billingr
John Doe,Engineering Jane Doe,Billingr
name,department John Doe,Engineering Jane Doe,Billing
name department John Doe Engineering Jane Doe Billing
name department "John Doe" Engineering "Jane Doe" Billing
name|department John Doe|Engineering Jane Doe|Billing
name;department John Doe;Engineering Jane Doe;Billing