Often referred to as render passes, modo's render outputs are extra elements in the render setup that will add a different layer in the final image, depending on the elements we want to work with. In other words, apart from the regular render where you get all the colors, textures, lights, and so on, you can generate many different outputs for a later use in Photoshop during the post-production phase.
There are many different outputs available to generate, many of them more advanced than others. We will focus on the main outputs, which are more useful for post-production of your image after the final render.
To add an extra render output, you should go to your shader tree. If you expand the render item, you will see first in the list two render outputs. By default, in a fresh new scene, those two outputs are automatically generated. One is the Alpha Output, which will generate a black and white version of the image separating the background of the rendered object itself...