Single point cutting tools contain only one main cutting edge in the cutter body. While machining with single point cutting tool, only one main cutting edge continuously remains in contact with work-piece.
Examples of single point cutters: Turning tool, Shaping tool, Planing tool, Slotting tool, Boring tool, Fly milling cutter, etc.
Multi point cutting tools contain more than one (even up to hundreds) cutting edges in the cutter body.
While machining with multi point cutting tool, more than one cutting edges simultaneously engage in material removal action in a pass.
Examples of multi-point cutters:, Milling cutters, Hobs, Broach, Grinding wheels, Reamer, Knurling tool, etc.