How do you add a thin outline? I am new at this. I am extracting files a game. In the game they have thin black outlines, but they aren't part of a model. I am having trouble finding anything about this. What is the simplest way to do this?

Update: I think I am looking for something like freestyle. What is the simplest way to use this to create a thin black outline around a model?
In your render settings enable freestyle.



Under render layers add a freestyle line set.





The line thickness is a quick way to adjust the size of the line drawn. For more control over what edges are used to draw lines and how the lines are drawn, you will need to look through the freestyle documentaion.