I just installed a Vanilla 9.1 instance as part of my upgrade process. I used the XP Scaled Topology, as I will need some of its features.
After installation, I found the following sites in IIS:
I can guess some of them - cd, cm, identityserver - but I'm at a loss for the others.
What is the function of the .collection, .ma, .mareporting, .prc, .processingEngine, .refdata, .rep, .reporting, .search websites in Sitecore 9.1?