Then, anything you type into that window is sent straight to the Unix machine, and everything the Unix machine sends back is displayed in the window. In really simple terms: you run PuTTY on a Mac machine and tell it to connect to (for example) a Unix machine.
Both alternatives will also install the command-line of the adaptations of PuTTYgen.
There are multiple ways to install PuTTY, which are Homebrew or MacPorts. However, to run PuTTYgen for Mac, the first one must have to install PuTTY.
