Basically, it's semantics. Potentially Unwanted Programs are bad, and you don't want them on your computer.
Here are a few: ASK, SlimCleaner, MyPC Backup, System Optimizer Pro, PC Optimizer, Babylon, SearchProtect, MapsGalaxy, TidyNetwork, CouponPrinter, StormAlerts, Optimizer Pro, Snap.Do, OpenSoftware Updates and anything served up by Conduit.
If you find any of these on your computer, clean it out or get it cleaned out. Most times, I can clean it up via remote connection, or you can drop off your computer for a thorough clean and update.
Read further for more information: http://www.howtogeek.com/232791/pups-explained-what-is-a-potentially-unwanted-program/