Earlier quoted context omitted.
No, WebKit is an engine. It ships with small demo browsers for some platforms (minibrowser for gtk, at least) but that's it. You might be confused by Apple calling its nightly Safari builds "WebKit technical preview" or whatever. It (used to) show up as "WebKit.app", but it's literally Apple Safari.
"Safari" is a proprietary browser that uses WebKit, which is open source. Safari Technology Preview (purple Safari) and WebKit.app (black Safari) are just Safari, but with the WebKit swapped out through various methods. Oh, and MiniBrowser works on macOS as well.
yes, that's exactly what I said