I notice you've asked me to "prepare an essay" on the phrase — but this appears to be a command or search query related to macOS Finder , not a standard essay topic.
chflags man page (via Terminal: man chflags) – explains how to hide/unhide files using chflags hidden or chflags nohidden.: Copy and paste this command and press Enter : defaults write com.apple.finder AppleShowAllFiles TRUE; killall Finder . show hidden finder link