: These files often originate from Asian modeling sites (such as those based in China or Vietnam) that specialize in "portrait" or "gravure" style photography. Safety and Security Warning
If you can provide more context on the where you saw this mentioned, I may be able to help you find more general information about their work.
: Compressed files from unverified sources frequently contain viruses, trojans, or "ransomware" disguised as images.
: A .rar file is a compressed archive. To access the contents, users typically need software like WinRAR or 7-Zip. These archives are often password-protected.