GLTF is a format for sharing 3D objects with materials and animations between rendering and modeling packages. For example, to import an object in the free and open source package Blender open the object. Click on the icon in the viewer to remove the axis and grid.
Click on the
export icon and select the option
GLTF. You can now save the file to your device.
Open Blender and select
File-Import and select
GLTF. You can now select the saved file from your local device.