Official Description: The Support Library is a static library that you can add to your Android application in order to use APIs that are either not available for older platform versions or utility APIs that aren't a part of the framework APIs. Compatible on devices running API 14 or later.

CommonsWare’s Notes

This library contains DrawerLayout, the stock Android solution for adding a navigation drawer to your UI. DrawerLayout supports drawers on the left or right side, and it can integrate with the Navigation component if you wish to use it to populate what goes in the drawer.

As with many of the Jetpack classes, DrawerLayout originated in the Android Support Library. If you see material referring to, that is the Android Support Library version. That material may be slightly out of date, but many of the concepts covered in older posts and articles may still have some value.