Whenever someone mentions a plugin for a daw like Logic, Ableton, etc. Is it always a VST plugin? so 'VST plugin' and 'plugin' is synonymous?
There are several plugin formats, and VST is only one of many. It was developed by Steinberg (now part of Yamaha) in 1996 for a very old version of Cubase. It is the most common format, but there are other popular formats. Some DAWs support VST plus other formats, and some DAWs don't support VSTs at all.