YouTube ReVanced (or ReVanced) is an unofficial, community-built fork of the YouTube Android app that adds features not present in the official app. Two common installation/usage terms you may see are DPI and nodpi — these relate to build variants and how the app handles display scaling on Android devices. A “portable” variant typically refers to a build packaged to be easily installed or run without full device modification.
While "portable" isn't an official ReVanced term, it generally refers to how the app is managed on your device: Between these two which should I use, nodpi or 320-640 dpi? youtube revanced dpi or nodpi portable