What the different between satin and semi gloss?

Satin is lower gloss than semi-gloss paint.

Paint finishes in order of decreasing gloss are:

* Gloss * Semi-gloss * Satin/Low sheen * Flat Some manufacturers call Satin/Low sheen finish Eggshell, and others regard this as a finish between Satin/Low sheen and Flat paint.

The higher the gloss finish the easier it is to clean, the higher its durabillity and the more it shows surface imperfections.