Amazon PPC glossary
Record type
The specific row category inside a bulk file, such as Campaign, Ad Group, Keyword, or Product Ad, each carrying its own required columns.
Where it matters most: Book 5, The Advanced PPC Clarity Guide, in the chapter “Bulk File Workflows.”
Go deeper
The glossary gives you the one-line answer. The Advanced PPC Clarity Guide explains why it matters and what to do about it.