IDV is the broader label federal data systems use for any contract you order work against rather than one with a single fixed scope, which covers IDIQs, BPAs, and schedule contracts alike. You will run into it more in spending data and contract-type fields than in a solicitation you are actually reading. If a listing describes something as an IDV, the real question is which specific kind it is, since that determines how orders get placed and who is eligible to compete for them.

In a sentence

"USASpending lists the base award's contract type as IDV, IDIQ, with individual orders tracked underneath it." The IDV label just tells you the money moves through orders rather than one lump payment, so look one level down at the specific vehicle type to understand how those orders actually get competed.