it’s used to verify that OpenGL ES2 works on your system. It’s the variant of 3D graphics drivers that is used on smartphones. Many apps nowadays write their GFX frontend with GLES2 so it uses the same code on phones and PCs, and if they compile the app to run in the web browser, WebGL is also based on GLES2.

O thanks! I needed glxgears equivalent for Wayland at some point