A <group> tag allows the scaling, rotation, and position of one or more elements of a VectorDrawable to be adjusted:

<vector xmlns:android="<http://schemas.android.com/apk/res/android>"
android:width="24dp"
android:height="24dp"
android:viewportWidth="24.0"
android:viewportHeight="24.0">
    <path
        android:pathData="M0,0 h4 v4 h-4 z"
        android:fillColor="#FF000000"/>

    <group
        android:name="middle square group"
        android:translateX="10"
        android:translateY="10"
        android:rotation="45">
        <path
            android:pathData="M0,0 h4 v4 h-4 z"
            android:fillColor="#FF000000"/>
    </group>

    <group
        android:name="last square group"
        android:translateX="18"
        android:translateY="18"
        android:scaleX="1.5">
        <path
            android:pathData="M0,0 h4 v4 h-4 z"
            android:fillColor="#FF000000"/>
    </group>
</vector>

The example code above contains three identical <path> tags, all describing black squares. The first square is unadjusted. The second square is wrapped in a <group> tag which moves it and rotates it by 45°. The third square is wrapped in a <group> tag which moves it and stretches it horizontally by 50%. The result is as follows:

A <group> tag can contain multiple <path> and <clip-path> tags. It can even contain another <group>.