A Special Warranty Deed is a legal document that transfers property ownership with limited title guarantees. Unlike a General Warranty Deed, a Special Warranty Deed only guarantees that the seller (grantor) has not created any title defects during their ownership period. The seller does not warrant against problems that existed before they owned the property.
In simple terms: The seller is saying "I own this property and haven't caused any problems with it during my time owning it, but I can't promise what happened before I owned it." This is a middle ground between a Quitclaim Deed (no guarantees) and a General Warranty Deed (full guarantees covering the entire history).