How can I round the edges of a mesh? I have looked at other similar questions on this site but couldn't answer my question. I have a model made of cubes the edges look very sharp (I would put a picture here but I don't have the required rep) is there a simple way to make the edges round?
You could use the Bevel Modifier from the properties panel.

Example with Segments set to 3 and Width 0.1 (red cube) Width 0.3 (blue cube)