ES6 is still somewhat more popular. It&#x27;s like a lot of terms that catch on even when they&#x27;re not officially accurate for what they describe (e.g. &#x27;HTML5&#x27; covering things like WebGL) - it often pays to go with common usage.<p>If the end digit had matched, I suspect it would have worked out better, but with ES2015 and ES6 being equivalent, it&#x27;s pretty confusing.