# What is the difference between “partial cover” and “cover”?

Degrees of cover and concealment are defined in the Player's Handbook (pp 280-281). There it discusses cover, superior cover, concealment, and total concealment.

However, many powers and features elsewhere make use of partial cover and partial concealment, which the PHB doesn't mention at all!

What do these new terms mean, and how are they different from regular cover and concealment?

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There is equal potential for confusion in the upper echelons of cover and concealment: better cover is called "superior cover," while excellent concealment is "total concealment." I see no particular reason these two similar effects should have different modifying terms, and am surprised that only one item (the Nightmare's Keen Senses from DR 393) is currently confused by this (according to a search of the Online Compendium at the time of this post).