Q. What is the difference between conference proceedings article and conference paper in IRIS?

A conference proceedings article is published in the proceedings of a conference and the proceedings can be found online or in physical format. E.g. ACM Symposium on Information, Computer and Communications Security found on ACM Digital Library, Innovative Applications of Artificial Intelligence Conference found on www.AAAI.org, Academy of Management Proceedings found on proceedings.aom.org.

A conference paper is presented at the conference but there is no published proceedings. E.g. INFORMS International Conference, Strategic Management Society Conference.