What is the difference between a pre-hung door and a slab door?

A 'slab' is simply the basic door portion with no holes or anything else. A Pre-hung

will come with all 3 jamb portions, hinges and a hole cut for a lock.

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He's right, but let me add a few details. Think of a "slab"door as a blank slate or a blank canvas. It has no frame (Jamb), may or may not have the lock-set

bored out, and has no mortise, (notches in the door edge), for the hinges. A "slab" door however may come in various styles, such as a blank or flat slab, or may have a pattern such as Colonial etc.

A pre-hung

door is one that is hung on a door jamb. It can consist of a slab door with no detail or Colonial or similar styling. The door is "pre-hung,"

on the door jamb with hinges and is bored out for the lock-set

.

Both slab and pre-hung

doors, can come pre-primed

or unfinished.