Track Matte

Track Matte: A technique in After Effects and motion design used to control the visibility of a layer based on the transparency or shape of another layer.A track matte works by pairing two layers:The matte layer (used to define the visible areas).The content layer (the layer being affected).Common track matte types include:Alpha Matte: Uses the transparency of the matte layer to reveal or hide the content layer.Luma Matte: Uses the brightness (light and dark areas) of the matte layer to control the visibility of the content layer.For example, you can use a track matte to make text appear inside a moving shape or reveal an image through an animated mask.