A special warranty deed is a deed transferring or conveying ownership of property in which the grantor (seller or transferor) promises (covenants) to defend the title only against other defects, liens, encumbrances, or claims made by the grantor or by someone claiming by or under the grantor.
In other words, a special warranty deed provides a limited warranty of title and does not warrant against claims or defects in the title that existed before the grantor took possession of the property.