In After Effects, what does the "Solo" button do for a layer?

The "Solo" button in After Effects serves a specific and essential function for layer management. When you activate the "Solo" button on a layer, it isolates that particular layer, allowing you to view it independently of all other layers in the composition. This is particularly useful when working with complex scenes consisting of multiple layers, as it helps you focus on the layer in question without distraction from others.

By isolating the layer, you can make adjustments and see the effects of changes directly without the interference or clutter of additional layers. Once you finish your edits, you can deactivate the "Solo" button to return to viewing all layers in the composition. This feature streamlines the editing process and enhances efficiency when making precise adjustments to a specific component of your project.