Dear Shuvojit,
PUP means Potentially Unwanted Program. For people that willingly install the program onto their computer then for them it is no PUP,
as they should be fully aware of what the program does or can do. When people get it unwillingly installed unto their computer (meaning not installing it themselves) then this really means they have a PUP. So the first P in PUP depends on what users do with it or not or how to qualify it.
regards,
polonus